[tools]: Generate intrinisic test cases

Add test/intrinsics/intrinsics.wgsl.tmpl that generates a vast set of intrinsic overload permutations into test/intrinsics/gen/...

Add expected output for all of these, including 'SKIP' headers for those that currently fail.

Fixed: tint:832
Change-Id: Id6888df52c07f35e7a55199f2ad4d842c6e2595c
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/53051
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: David Neto <dneto@google.com>
diff --git a/test/intrinsics/gen/textureStore/5a2f8f.wgsl.expected.wgsl b/test/intrinsics/gen/textureStore/5a2f8f.wgsl.expected.wgsl
new file mode 100644
index 0000000..3053085
--- /dev/null
+++ b/test/intrinsics/gen/textureStore/5a2f8f.wgsl.expected.wgsl
@@ -0,0 +1,20 @@
+[[group(1), binding(0)]] var arg_0 : [[access(write)]] texture_storage_1d<rgba16sint>;
+
+fn textureStore_5a2f8f() {
+  textureStore(arg_0, 1, vec4<i32>());
+}
+
+[[stage(vertex)]]
+fn vertex_main() {
+  textureStore_5a2f8f();
+}
+
+[[stage(fragment)]]
+fn fragment_main() {
+  textureStore_5a2f8f();
+}
+
+[[stage(compute)]]
+fn compute_main() {
+  textureStore_5a2f8f();
+}