Set wave64 as default for compute shaders on GFX10.3
Set wave64 as default for compute shaders on GFX10.3

In general, compute shaders with wave64 are better than wave32 on
GFX10.3.

GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc