ac: force enable -structurizecfg-skip-uniform-regions for LLVM 11

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4696>

src/amd/llvm/ac_llvm_util.c

@@ -69,6 +69,10 @@ static void ac_init_llvm_target()
 #if LLVM_VERSION_MAJOR >= 10
 		/* Atomic optimizations require LLVM 10.0 for gfx10 support. */
 		"-amdgpu-atomic-optimizations=true",
+#endif
+#if LLVM_VERSION_MAJOR >= 11
+		/* This was disabled by default in: https://reviews.llvm.org/D77228 */
+		"-structurizecfg-skip-uniform-regions",
 #endif
 	};
 	LLVMParseCommandLineOptions(ARRAY_SIZE(argv), argv, NULL);