AMDGPU: Remove mubuf specific PatFrags
AMDGPU: Remove mubuf specific PatFrags

These are identical to the *_global PatFrag, and will only create more
work to get the GlobalISel importer to handle them.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@365350 91177308-0d34-0410-b5e6-96231b3b80d8

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