Fixup [AMDGPU] intrintrics for byte/short load/store
Fixup [AMDGPU] intrintrics for byte/short load/store

This fixes test/CodeGen/AMDGPU/llvm.amdgcn.buffer.load.ll

Change-Id: Ibbedec3f431dd843f1e64f793b5c5b06c7b5f97c

GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm