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>

test/vk-gl-cts/graphicsfuzz/struct-array-index/0.spvasm

@@ -0,0 +1,97 @@
+               OpCapability Shader
+          %1 = OpExtInstImport "GLSL.std.450"
+               OpMemoryModel Logical GLSL450
+               OpEntryPoint Fragment %main "main" %_GLF_color
+               OpExecutionMode %main OriginUpperLeft
+               OpSource ESSL 320
+               OpName %main "main"
+               OpName %struct_base "struct_base"
+               OpMemberName %struct_base 0 "data"
+               OpMemberName %struct_base 1 "leftIndex"
+               OpMemberName %struct_base 2 "rightIndex"
+               OpName %struct_array "struct_array"
+               OpName %index "index"
+               OpName %buf0 "buf0"
+               OpMemberName %buf0 0 "injectionSwitch"
+               OpName %_ ""
+               OpName %_GLF_color "_GLF_color"
+               OpMemberDecorate %buf0 0 Offset 0
+               OpDecorate %buf0 Block
+               OpDecorate %_ DescriptorSet 0
+               OpDecorate %_ Binding 0
+               OpDecorate %_GLF_color Location 0
+       %void = OpTypeVoid
+         %10 = OpTypeFunction %void
+        %int = OpTypeInt 32 1
+%struct_base = OpTypeStruct %int %int %int
+       %uint = OpTypeInt 32 0
+     %uint_3 = OpConstant %uint 3
+%_arr_struct_base_uint_3 = OpTypeArray %struct_base %uint_3
+%_ptr_Private__arr_struct_base_uint_3 = OpTypePointer Private %_arr_struct_base_uint_3
+%struct_array = OpVariable %_ptr_Private__arr_struct_base_uint_3 Private
+      %int_1 = OpConstant %int 1
+         %17 = OpConstantComposite %struct_base %int_1 %int_1 %int_1
+         %18 = OpConstantComposite %_arr_struct_base_uint_3 %17 %17 %17
+%_ptr_Function_int = OpTypePointer Function %int
+      %int_2 = OpConstant %int 2
+%_ptr_Private_int = OpTypePointer Private %int
+       %bool = OpTypeBool
+      %float = OpTypeFloat 32
+    %v2float = OpTypeVector %float 2
+       %buf0 = OpTypeStruct %v2float
+%_ptr_Uniform_buf0 = OpTypePointer Uniform %buf0
+          %_ = OpVariable %_ptr_Uniform_buf0 Uniform
+      %int_0 = OpConstant %int 0
+     %uint_0 = OpConstant %uint 0
+%_ptr_Uniform_float = OpTypePointer Uniform %float
+     %uint_1 = OpConstant %uint 1
+    %v4float = OpTypeVector %float 4
+%_ptr_Output_v4float = OpTypePointer Output %v4float
+ %_GLF_color = OpVariable %_ptr_Output_v4float Output
+    %float_1 = OpConstant %float 1
+    %float_0 = OpConstant %float 0
+         %34 = OpConstantComposite %v4float %float_1 %float_0 %float_0 %float_1
+         %35 = OpConstantComposite %v4float %float_1 %float_1 %float_1 %float_1
+       %main = OpFunction %void None %10
+         %36 = OpLabel
+      %index = OpVariable %_ptr_Function_int Function
+               OpStore %struct_array %18
+               OpStore %index %int_1
+         %37 = OpAccessChain %_ptr_Private_int %struct_array %int_1 %int_2
+               OpStore %37 %int_1
+         %38 = OpAccessChain %_ptr_Private_int %struct_array %int_1 %int_1
+         %39 = OpLoad %int %38
+         %40 = OpIEqual %bool %39 %int_1
+               OpSelectionMerge %41 None
+               OpBranchConditional %40 %42 %43
+         %42 = OpLabel
+         %44 = OpAccessChain %_ptr_Uniform_float %_ %int_0 %uint_0
+         %45 = OpLoad %float %44
+         %46 = OpConvertFToS %int %45
+         %47 = OpAccessChain %_ptr_Private_int %struct_array %46 %int_2
+         %48 = OpLoad %int %47
+               OpStore %index %48
+               OpBranch %41
+         %43 = OpLabel
+         %49 = OpAccessChain %_ptr_Uniform_float %_ %int_0 %uint_1
+         %50 = OpLoad %float %49
+         %51 = OpConvertFToS %int %50
+         %52 = OpAccessChain %_ptr_Private_int %struct_array %51 %int_1
+         %53 = OpLoad %int %52
+               OpStore %index %53
+               OpBranch %41
+         %41 = OpLabel
+         %54 = OpAccessChain %_ptr_Private_int %struct_array %int_1 %int_1
+         %55 = OpLoad %int %54
+         %56 = OpIEqual %bool %55 %int_1
+               OpSelectionMerge %57 None
+               OpBranchConditional %56 %58 %59
+         %58 = OpLabel
+               OpStore %_GLF_color %34
+               OpBranch %57
+         %59 = OpLabel
+               OpStore %_GLF_color %35
+               OpBranch %57
+         %57 = OpLabel
+               OpReturn
+               OpFunctionEnd