[spirv-reader] Add OpCompositeConstruct

Bug: tint:3
Change-Id: Ibb1a4124e7e7b7a5b95bdd4e7c7e7f1c570e641c
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/23127
Reviewed-by: dan sinclair <dsinclair@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 9dbeb92..c938abb 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -644,6 +644,7 @@
     "src/reader/spirv/function_arithmetic_test.cc",
     "src/reader/spirv/function_bit_test.cc",
     "src/reader/spirv/function_cfg_test.cc",
+    "src/reader/spirv/function_composite_test.cc",
     "src/reader/spirv/function_conversion_test.cc",
     "src/reader/spirv/function_decl_test.cc",
     "src/reader/spirv/function_glsl_std_450_test.cc",