Disable SizedArrayOfStruct tests for D3D12 + tint

Bug: tint:683
Change-Id: I55c513108cb5c8e14bd72bb8dd3177afff353623
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/46370
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

src/tests/end2end/ComputeCopyStorageBufferTests.cpp

@@ -110,6 +110,9 @@ TEST_P(ComputeCopyStorageBufferTests, SizedArrayOfBasic) {
 
 // Test that a slightly-less-trivial compute-shader memcpy implementation works.
 TEST_P(ComputeCopyStorageBufferTests, SizedArrayOfStruct) {
+    // TODO(crbug.com/tint/683): internal compiler error: TINT_UNIMPLEMENTED
+    DAWN_SKIP_TEST_IF(IsD3D12() && HasToggleEnabled("use_tint_generator"));
+
     BasicTest(R"(
         struct S {
             a : vec2<u32>;