Fix warpSize for gfx10

Change-Id: I8029ebeb91db1efa8e166ad349aaae6364e8069d


[ROCm/hip commit: c7ac5531d3]

projects/hip/include/hip/hcc_detail/device_functions.h

@@ -306,7 +306,17 @@ __device__ static inline int __hip_move_dpp_N(int src) {
                                     bound_ctrl);
 }
 
-static constexpr int warpSize = 64;
+// FIXME: Remove the following workaround once the clang change is released.
+// This is for backward compatibility with older clang which does not define
+// __AMDGCN_WAVEFRONT_SIZE. It does not consider -mwavefrontsize64.
+#ifndef __AMDGCN_WAVEFRONT_SIZE
+#if __gfx1010__ || __gfx1011__ || __gfx1012__ || __gfx1030__ || __gfx1031__
+#define __AMDGCN_WAVEFRONT_SIZE 32
+#else
+#define __AMDGCN_WAVEFRONT_SIZE 64
+#endif
+#endif
+static constexpr int warpSize = __AMDGCN_WAVEFRONT_SIZE;
 
 __device__
 inline