tint: Add builtin type aliases (vec3f, etc)

Fixed: tint:1772
Change-Id: I4bed36ded91ca5288875ed6ea819ff4bbb432186
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/112340
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: James Price <jrprice@google.com>
diff --git a/test/tint/shadowing/alias/builtin/param.wgsl.expected.glsl b/test/tint/shadowing/alias/builtin/param.wgsl.expected.glsl
new file mode 100644
index 0000000..1d19750
--- /dev/null
+++ b/test/tint/shadowing/alias/builtin/param.wgsl.expected.glsl
@@ -0,0 +1,10 @@
+#version 310 es
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void unused_entry_point() {
+  return;
+}
+void f(vec3 vec3f) {
+  vec3 b = vec3f;
+}
+