[PATCH] D34994: [table] Avoid creating temporary strings

[Alexander Shaposhnikov via Phabricator via llvm-commits]

alexshap created this revision.

If a method / function returns a StringRef but the
variable is of type const std::string& a temporary string is
created (StringRef has a cast operator to std::string),
which is a suboptimal behavior.

Test plan: make check-all

This cleanup is a continuation of the efforts started
in https://reviews.llvm.org/D34969 and https://reviews.llvm.org/D34970.
The changes are broken up into multiples diffs 
to make reviewing / landing / reverting (if necessary) easier.

Test plan: make check-all


Repository:
  rL LLVM

https://reviews.llvm.org/D34994

Files:
  utils/TableGen/FixedLenDecoderEmitter.cpp
  utils/TableGen/SearchableTableEmitter.cpp
  utils/TableGen/SubtargetEmitter.cpp
  utils/TableGen/X86RecognizableInstr.cpp

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