SWDEV-396533 - correct _shfl function to match cuda

Signed-off-by: sdashmiz <shadi.dashmiz@amd.com>
Change-Id: I311419fd25c055339f25fe0c7a132ec9ee225600

hipamd/include/hip/amd_detail/amd_warp_functions.h

@@ -89,7 +89,7 @@ __device__
 inline
 int __shfl(int var, int src_lane, int width = warpSize) {
     int self = __lane_id();
-    int index = src_lane + (self & ~(width-1));
+    int index = (src_lane & (width - 1)) + (self & ~(width-1));
     return __builtin_amdgcn_ds_bpermute(index<<2, var);
 }
 __device__