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/undefined-integer-in-function/0-opt.spvasm.expected.wgsl

@@ -0,0 +1,72 @@
+[[block]]
+struct buf0 {
+  injectionSwitch : vec2<f32>;
+};
+
+var<private> x_GLF_color : vec4<f32>;
+
+[[group(0), binding(0)]] var<uniform> x_6 : buf0;
+
+fn performPartition_() -> i32 {
+  var GLF_live0i : i32;
+  var i : i32;
+  var x_11 : i32;
+  var x_10_phi : i32;
+  x_GLF_color = vec4<f32>(1.0, 0.0, 0.0, 1.0);
+  x_10_phi = 0;
+  loop {
+    var x_11_phi : i32;
+    let x_10 : i32 = x_10_phi;
+    var x_42 : bool;
+    let x_41 : f32 = x_6.injectionSwitch.y;
+    x_42 = (x_41 < 0.0);
+    if (x_42) {
+      x_11_phi = x_10;
+      continue;
+    } else {
+      GLF_live0i = 0;
+      loop {
+        let x_47 : bool = (0 < 1);
+        if (x_42) {
+          break;
+        }
+        return 1;
+      }
+      if (x_42) {
+        loop {
+          return 1;
+        }
+        return 0;
+      }
+      x_11_phi = x_10;
+      continue;
+    }
+    x_11_phi = 0;
+
+    continuing {
+      x_11 = x_11_phi;
+      x_10_phi = x_11;
+      if (false) {
+      } else {
+        break;
+      }
+    }
+  }
+  return x_11;
+}
+
+fn main_1() {
+  let x_9 : i32 = performPartition_();
+  return;
+}
+
+struct main_out {
+  [[location(0)]]
+  x_GLF_color_1 : vec4<f32>;
+};
+
+[[stage(fragment)]]
+fn main() -> main_out {
+  main_1();
+  return main_out(x_GLF_color);
+}