AMDGPU/NFC: Cleanup/refactor SIMemoryLegalizer [1]:
AMDGPU/NFC: Cleanup/refactor SIMemoryLegalizer [1]:

  - Rename MemOpInfo -> SIMemOpInfo
  - Move SIMemOpInfo class out of SIMemoryLegalizer class

Differential Revision: https://reviews.llvm.org/D37394


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@312540 91177308-0d34-0410-b5e6-96231b3b80d8

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