[PATCH] D157010: [llvm][ADT] Make `Twine` aware of `StringLiteral`

[Jan Svoboda via Phabricator via llvm-commits]

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The `const char *` storage backing StringLiteral has static lifetime. Making `Twine` aware of that allows us to avoid allocating heap memory when printing its contents.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157010

Files:
  llvm/include/llvm/ADT/Twine.h
  llvm/lib/Support/Twine.cpp
  llvm/unittests/ADT/TwineTest.cpp

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