AMDGPU: Remove unnecessary string usage in AsmPrinter
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. llvm-svn: 274581
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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. llvm-svn: 274581