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/var/textureStore/872747.wgsl.expected.msl b/test/tint/builtins/gen/var/textureStore/872747.wgsl.expected.msl
new file mode 100644
index 0000000..fcb5caa
--- /dev/null
+++ b/test/tint/builtins/gen/var/textureStore/872747.wgsl.expected.msl
@@ -0,0 +1,35 @@
+#include <metal_stdlib>
+
+using namespace metal;
+void textureStore_872747(texture1d<float, access::write> tint_symbol_1) {
+  int arg_1 = 1;
+  float4 arg_2 = float4(0.0f);
+  tint_symbol_1.write(arg_2, uint(arg_1));
+}
+
+struct tint_symbol {
+  float4 value [[position]];
+};
+
+float4 vertex_main_inner(texture1d<float, access::write> tint_symbol_2) {
+  textureStore_872747(tint_symbol_2);
+  return float4(0.0f);
+}
+
+vertex tint_symbol vertex_main(texture1d<float, access::write> tint_symbol_3 [[texture(0)]]) {
+  float4 const inner_result = vertex_main_inner(tint_symbol_3);
+  tint_symbol wrapper_result = {};
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+fragment void fragment_main(texture1d<float, access::write> tint_symbol_4 [[texture(0)]]) {
+  textureStore_872747(tint_symbol_4);
+  return;
+}
+
+kernel void compute_main(texture1d<float, access::write> tint_symbol_5 [[texture(0)]]) {
+  textureStore_872747(tint_symbol_5);
+  return;
+}
+