[GISel] Pass MachineRegisterInfo by const reference to matcher.
[GISel] Pass MachineRegisterInfo by const reference to matcher.

Summary: NFC.

Reviewers: aditya_nandakumar, volkan

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D65971

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@368747 91177308-0d34-0410-b5e6-96231b3b80d8

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