Add tests derived from VK-GL-CTS

This adds SPIR-V assembly and WGSL tests derived from VK-GL-CTS commit
571256871c2e2f03995373e1e4a02958d8cd8cf5. The following procedure was
followed:

- Those .amber files in VK-GL-CTS wholly owned by Google were
  identified

- All GLSL and SPIR-V shaders were extracted from the Amber files and
  converted into SPIR-V binaries

- The compact-ids pass of spirv-opt was applied to each binary

- Duplicate binaries were removed

- spirv-opt -O was used to obtain an optimized version of each remaining
  binary, with duplicates discarded

- Binaries that failed validation using spirv-val with target
  environment SPIR-V 1.3 were discarded

- Those binaries that tint could not successfully convert into WGSL were
  put aside for further investigation

- SPIR-V assembly versions of the remaining binaries are included in
  this CL

- test-runner with -generate-expected and -generate-skip was used to
  generate expected .spvasm, .msl, .hlsl and .wgsl outputs for these
  SPIR-V assembly tests

- Each successfully-generated .expected.wgsl is included in this CL
  again, as a WGLSL test

- test-runner with -generate-expected and -generate-skip was used again,
  to generate expected outputs for these WGSL tests

Change-Id: Ibe9baf2729cf97e0b633db9a426f53362a5de540
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/58842
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
diff --git a/test/vk-gl-cts/graphicsfuzz/cov-reduce-load-replace-extract/0-opt.wgsl.expected.spvasm b/test/vk-gl-cts/graphicsfuzz/cov-reduce-load-replace-extract/0-opt.wgsl.expected.spvasm
new file mode 100644
index 0000000..5969228
--- /dev/null
+++ b/test/vk-gl-cts/graphicsfuzz/cov-reduce-load-replace-extract/0-opt.wgsl.expected.spvasm
@@ -0,0 +1,170 @@
+SKIP: FAILED
+
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 93
+; Schema: 0
+               OpCapability Shader
+               OpMemoryModel Logical GLSL450
+               OpEntryPoint Fragment %main "main" %tint_symbol_1
+               OpExecutionMode %main OriginUpperLeft
+               OpName %buf0 "buf0"
+               OpMemberName %buf0 0 "one"
+               OpName %x_10 "x_10"
+               OpName %x_GLF_color "x_GLF_color"
+               OpName %tint_symbol_1 "tint_symbol_1"
+               OpName %S "S"
+               OpMemberName %S 0 "x"
+               OpMemberName %S 1 "y"
+               OpName %func_struct_S_i1_i11_ "func_struct_S_i1_i11_"
+               OpName %arg "arg"
+               OpName %main_1 "main_1"
+               OpName %a "a"
+               OpName %b "b"
+               OpName %param "param"
+               OpName %main_out "main_out"
+               OpMemberName %main_out 0 "x_GLF_color_1"
+               OpName %tint_symbol_2 "tint_symbol_2"
+               OpName %tint_symbol "tint_symbol"
+               OpName %main "main"
+               OpDecorate %buf0 Block
+               OpMemberDecorate %buf0 0 Offset 0
+               OpDecorate %x_10 NonWritable
+               OpDecorate %x_10 DescriptorSet 0
+               OpDecorate %x_10 Binding 0
+               OpDecorate %tint_symbol_1 Location 0
+               OpMemberDecorate %S 0 Offset 0
+               OpMemberDecorate %S 1 Offset 4
+               OpDecorate %_arr_S_uint_2 ArrayStride 8
+               OpMemberDecorate %main_out 0 Offset 0
+        %int = OpTypeInt 32 1
+       %buf0 = OpTypeStruct %int
+%_ptr_Uniform_buf0 = OpTypePointer Uniform %buf0
+       %x_10 = OpVariable %_ptr_Uniform_buf0 Uniform
+      %float = OpTypeFloat 32
+    %v4float = OpTypeVector %float 4
+%_ptr_Private_v4float = OpTypePointer Private %v4float
+          %9 = OpConstantNull %v4float
+%x_GLF_color = OpVariable %_ptr_Private_v4float Private %9
+%_ptr_Output_v4float = OpTypePointer Output %v4float
+%tint_symbol_1 = OpVariable %_ptr_Output_v4float Output %9
+       %void = OpTypeVoid
+          %S = OpTypeStruct %int %int
+%_ptr_Function_S = OpTypePointer Function %S
+         %12 = OpTypeFunction %void %_ptr_Function_S
+       %uint = OpTypeInt 32 0
+     %uint_1 = OpConstant %uint 1
+%_ptr_Function_int = OpTypePointer Function %int
+      %int_1 = OpConstant %int 1
+         %25 = OpTypeFunction %void
+%_ptr_Function_float = OpTypePointer Function %float
+         %30 = OpConstantNull %float
+     %uint_2 = OpConstant %uint 2
+%_arr_S_uint_2 = OpTypeArray %S %uint_2
+%_ptr_Function__arr_S_uint_2 = OpTypePointer Function %_arr_S_uint_2
+         %35 = OpConstantNull %_arr_S_uint_2
+         %37 = OpConstantNull %S
+    %float_5 = OpConstant %float 5
+     %uint_0 = OpConstant %uint 0
+%_ptr_Uniform_int = OpTypePointer Uniform %int
+       %bool = OpTypeBool
+    %float_0 = OpConstant %float 0
+      %false = OpConstantFalse %bool
+    %float_1 = OpConstant %float 1
+         %79 = OpConstantComposite %v4float %float_1 %float_0 %float_0 %float_1
+         %80 = OpConstantComposite %v4float %float_0 %float_0 %float_0 %float_0
+   %main_out = OpTypeStruct %v4float
+         %81 = OpTypeFunction %void %main_out
+%func_struct_S_i1_i11_ = OpFunction %void None %12
+        %arg = OpFunctionParameter %_ptr_Function_S
+         %18 = OpLabel
+         %23 = OpAccessChain %_ptr_Function_int %arg %uint_1
+               OpStore %23 %int_1
+               OpReturn
+               OpFunctionEnd
+     %main_1 = OpFunction %void None %25
+         %27 = OpLabel
+          %a = OpVariable %_ptr_Function_float Function %30
+          %b = OpVariable %_ptr_Function__arr_S_uint_2 Function %35
+      %param = OpVariable %_ptr_Function_S Function %37
+               OpStore %a %float_5
+               OpBranch %39
+         %39 = OpLabel
+               OpLoopMerge %40 %41 None
+               OpBranch %42
+         %42 = OpLabel
+         %45 = OpAccessChain %_ptr_Uniform_int %x_10 %uint_0
+         %46 = OpLoad %int %45
+         %47 = OpAccessChain %_ptr_Function_int %b %46 %uint_0
+               OpStore %47 %int_1
+         %48 = OpAccessChain %_ptr_Function_int %b %int_1 %uint_0
+         %49 = OpLoad %int %48
+         %50 = OpIEqual %bool %49 %int_1
+               OpSelectionMerge %52 None
+               OpBranchConditional %50 %53 %52
+         %53 = OpLabel
+         %54 = OpAccessChain %_ptr_Uniform_int %x_10 %uint_0
+         %55 = OpLoad %int %54
+         %56 = OpIEqual %bool %55 %int_1
+               OpSelectionMerge %57 None
+               OpBranchConditional %56 %58 %57
+         %58 = OpLabel
+               OpBranch %40
+         %57 = OpLabel
+         %59 = OpAccessChain %_ptr_Function_S %b %int_1
+         %60 = OpLoad %S %59
+               OpStore %param %60
+         %61 = OpFunctionCall %void %func_struct_S_i1_i11_ %param
+         %63 = OpLoad %S %param
+         %64 = OpAccessChain %_ptr_Function_S %b %int_1
+               OpStore %64 %63
+         %65 = OpAccessChain %_ptr_Function_int %b %int_1 %uint_1
+         %66 = OpLoad %int %65
+         %67 = OpConvertSToF %float %66
+               OpStore %a %67
+               OpBranch %52
+         %52 = OpLabel
+               OpStore %a %float_0
+               OpBranch %41
+         %41 = OpLabel
+               OpSelectionMerge %70 None
+               OpBranchConditional %false %71 %72
+         %71 = OpLabel
+               OpBranch %70
+         %72 = OpLabel
+               OpBranch %40
+         %70 = OpLabel
+               OpBranch %39
+         %40 = OpLabel
+         %73 = OpLoad %float %a
+         %74 = OpFOrdEqual %bool %73 %float_5
+               OpSelectionMerge %75 None
+               OpBranchConditional %74 %76 %77
+         %76 = OpLabel
+               OpStore %x_GLF_color %79
+               OpBranch %75
+         %77 = OpLabel
+               OpStore %x_GLF_color %80
+               OpBranch %75
+         %75 = OpLabel
+               OpReturn
+               OpFunctionEnd
+%tint_symbol_2 = OpFunction %void None %81
+%tint_symbol = OpFunctionParameter %main_out
+         %85 = OpLabel
+         %86 = OpCompositeExtract %v4float %tint_symbol 0
+               OpStore %tint_symbol_1 %86
+               OpReturn
+               OpFunctionEnd
+       %main = OpFunction %void None %25
+         %88 = OpLabel
+         %89 = OpFunctionCall %void %main_1
+         %91 = OpLoad %v4float %x_GLF_color
+         %92 = OpCompositeConstruct %main_out %91
+         %90 = OpFunctionCall %void %tint_symbol_2 %92
+               OpReturn
+               OpFunctionEnd
+1:1: The continue construct with the continue target 41[%41] is not post dominated by the back-edge block 70[%70]
+  %70 = OpLabel
+