Fix __clang_cuda_math_forward_declares.h

Recent change from `#if !defined(__CUDA__)` to `#if !__CUDA__` caused
regression on ROCm 3.5 since there is `#define __CUDA__`
before inclusion of the header file, which causes `#if !__CUDA__`
to be invalid.

Change `#if !__CUDA__` back to `#if !defined(__CUDA__)` for backward
compatibility.

diff --git a/clang/lib/Headers/__clang_cuda_math_forward_declares.h b/clang/lib/Headers/__clang_cuda_math_forward_declares.h
index 7c0b357..8a27085 100644 (file)
--- a/clang/lib/Headers/__clang_cuda_math_forward_declares.h
+++ b/clang/lib/Headers/__clang_cuda_math_forward_declares.h
@@ -8,7 +8,7 @@
  */
 #ifndef __CLANG__CUDA_MATH_FORWARD_DECLARES_H__
 #define __CLANG__CUDA_MATH_FORWARD_DECLARES_H__
-#if !__CUDA__ && !__HIP__
+#if !defined(__CUDA__) && !__HIP__
 #error "This file is for CUDA/HIP compilation only."
 #endif