Use correct WARP_SIZE for gfx1030 (#348)

[ROCm/rccl commit: 9c718ce6d6]

projects/rccl/src/include/devcomm.h

@@ -61,7 +61,11 @@ union ncclLLFifoLine {
   int4 i4;
 };
 
+#if defined(__gfx1030__)
+#define WARP_SIZE 32
+#else
 #define WARP_SIZE 64
+#endif
 #define MAXCHANNELS 32
 #define NCCL_MAX_NTHREADS 256
 #define NCCL_SIMPLE_MAX_NTHREADS NCCL_MAX_NTHREADS