[InstCombine][AMDGPU] Handle more buffer intrinsics
Summary:
Include the following intrinsics in the InsctCombine
simplification:
* amdgcn_raw_buffer_load
* amdgcn_raw_buffer_load_format
* amdgcn_struct_buffer_load
* amdgcn_struct_buffer_load_format
Change-Id: I14deceff74bcb21179baf6aa6e94bf39e7d63d5d
Reviewers: arsenm
Reviewed By: arsenm
Subscribers: arsenm, kzhuravl, jvesely, wdng, nhaehnle, yaxunl, dstuttard, tpr, t-tye, llvm-commits
Differential Revision: https://reviews.llvm.org/D55882
llvm-svn: 349735