[spirv-writer] Revert change to entry point name.

This CL rolls the entry point name change back for the spirv-backend to
allow Dawn to continue to work.

We'll need to roll this together with the inspector change, MSL and HLSL
changes.

Bug: tint:273
Change-Id: I54e7e05a4c277d6c55bd6808f50fb0c7903bc418
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/32500
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: David Neto <dneto@google.com>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: dan sinclair <dsinclair@chromium.org>

src/writer/spirv/builder.cc

diff --git a/src/writer/spirv/builder.cc b/src/writer/spirv/builder.cc
index 3af0441..9462723 100644
--- a/src/writer/spirv/builder.cc
+++ b/src/writer/spirv/builder.cc
@@ -419,8 +419,14 @@
     return false;
   }
 
+  // TODO(dsinclair): This should be using the namer to update the entry point
+  // name to a non-user provided string. Disable for now until we can update
+  // the inspector and land the same change in MSL / HLSL to all roll into Dawn
+  // at the same time.
+  // OperandList operands = {Operand::Int(stage), Operand::Int(id),
+  //                         Operand::String(namer_.NameFor(func->name()))};
   OperandList operands = {Operand::Int(stage), Operand::Int(id),
-                          Operand::String(namer_.NameFor(func->name()))};
+                          Operand::String(func->name())};
 
   for (const auto* var : func->referenced_module_variables()) {
     // For SPIR-V 1.3 we only output Input/output variables. If we update to

src/writer/spirv/builder_function_decoration_test.cc

diff --git a/src/writer/spirv/builder_function_decoration_test.cc b/src/writer/spirv/builder_function_decoration_test.cc
index 452efd2..1554bc2 100644
--- a/src/writer/spirv/builder_function_decoration_test.cc
+++ b/src/writer/spirv/builder_function_decoration_test.cc
@@ -49,7 +49,7 @@
   Builder b(&mod);
   ASSERT_TRUE(b.GenerateFunction(&func)) << b.error();
   EXPECT_EQ(DumpInstructions(b.entry_points()),
-            R"(OpEntryPoint Vertex %3 "tint_6d61696e"
+            R"(OpEntryPoint Vertex %3 "main"
 )");
 }
 
@@ -134,7 +134,7 @@
 %9 = OpTypeFunction %10
 )");
   EXPECT_EQ(DumpInstructions(b.entry_points()),
-            R"(OpEntryPoint Vertex %11 "tint_6d61696e"
+            R"(OpEntryPoint Vertex %11 "main"
 )");
 }
 
@@ -203,7 +203,7 @@
 %9 = OpTypeFunction %10
 )");
   EXPECT_EQ(DumpInstructions(b.entry_points()),
-            R"(OpEntryPoint Vertex %11 "tint_6d61696e" %4 %1
+            R"(OpEntryPoint Vertex %11 "main" %4 %1
 )");
 }
 
@@ -270,8 +270,8 @@
   ASSERT_TRUE(b.GenerateFunction(&func1)) << b.error();
   ASSERT_TRUE(b.GenerateFunction(&func2)) << b.error();
   EXPECT_EQ(DumpBuilder(b),
-            R"(OpEntryPoint Fragment %3 "tint_6d61696e31"
-OpEntryPoint Fragment %5 "tint_6d61696e32"
+            R"(OpEntryPoint Fragment %3 "main1"
+OpEntryPoint Fragment %5 "main2"
 OpExecutionMode %3 OriginUpperLeft
 OpExecutionMode %5 OriginUpperLeft
 OpName %3 "tint_6d61696e31"

src/writer/spirv/builder_function_test.cc

diff --git a/src/writer/spirv/builder_function_test.cc b/src/writer/spirv/builder_function_test.cc
index 6b540de..5677d76 100644
--- a/src/writer/spirv/builder_function_test.cc
+++ b/src/writer/spirv/builder_function_test.cc
@@ -261,8 +261,8 @@
   ASSERT_TRUE(b.Build());
   EXPECT_EQ(DumpBuilder(b), R"(OpCapability Shader
 OpMemoryModel Logical GLSL450
-OpEntryPoint GLCompute %7 "tint_61"
-OpEntryPoint GLCompute %17 "tint_62"
+OpEntryPoint GLCompute %7 "a"
+OpEntryPoint GLCompute %17 "b"
 OpExecutionMode %7 LocalSize 1 1 1
 OpExecutionMode %17 LocalSize 1 1 1
 OpName %3 "tint_44617461"