[PATCH] D22003: AMDGPU: Remove unnecessary string usage in AsmPrinter

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: tstellarAMD.
arsenm added a subscriber: llvm-commits.
Herald added subscribers: kzhuravl, arsenm.

Registers are printed a lot, so don't create temporary
std::strings. Using char instead of a string to an ostream
saves a function call.

http://reviews.llvm.org/D22003

Files:
  lib/Target/AMDGPU/InstPrinter/AMDGPUInstPrinter.cpp
  lib/Target/AMDGPU/InstPrinter/AMDGPUInstPrinter.h

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