tint: Add builtin tests for arguments passed by var

Change-Id: I81b69d23e40675d7f525e6369afec9aa0659d043
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/92321
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
diff --git a/test/tint/builtins/gen/literal/textureSampleCompare/af1051.wgsl.expected.hlsl b/test/tint/builtins/gen/literal/textureSampleCompare/af1051.wgsl.expected.hlsl
new file mode 100644
index 0000000..60ff095
--- /dev/null
+++ b/test/tint/builtins/gen/literal/textureSampleCompare/af1051.wgsl.expected.hlsl
@@ -0,0 +1,11 @@
+Texture2DArray arg_0 : register(t0, space1);
+SamplerComparisonState arg_1 : register(s1, space1);
+
+void textureSampleCompare_af1051() {
+  float res = arg_0.SampleCmp(arg_1, float3(0.0f, 0.0f, float(1)), 1.0f, (0).xx);
+}
+
+void fragment_main() {
+  textureSampleCompare_af1051();
+  return;
+}