Suppress ProvokingVertexTest.FlatTriWithTransformFeedback on Mac AMD

src/tests/gl_tests/ProvokingVertexTest.cpp

@@ -140,6 +140,15 @@ TEST_P(ProvokingVertexTest, FlatTriangle)
 // Ensure that any provoking vertex shenanigans still gives correct vertex streams.
 TEST_P(ProvokingVertexTest, FlatTriWithTransformFeedback)
 {
+    // TODO(cwallez) figure out why it is broken on AMD on Mac
+#if defined(ANGLE_PLATFORM_APPLE)
+    if (isAMD())
+    {
+        std::cout << "Test skipped on AMD on Mac." << std::endl;
+        return;
+    }
+#endif
+
     glGenTransformFeedbacks(1, &mTransformFeedback);
     glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, mTransformFeedback);