[PATCH] D120990: [demangler] Add StringView conversion operator

[Nathan Sidwell via Phabricator via llvm-commits]

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The OutputBuffer class tries to present a NUL-terminated string API to consumers.  But several of them would prefer a StringView.  In particular the Microsoft demangler, juggles between NUL-terminated and StringView, which is confusing.

This adds a StringView conversion, and adjusts the Demanglers that can benefit from that.


https://reviews.llvm.org/D120990

Files:
  libcxxabi/src/demangle/Utility.h
  llvm/include/llvm/Demangle/Utility.h
  llvm/lib/Demangle/MicrosoftDemangle.cpp
  llvm/lib/Demangle/MicrosoftDemangleNodes.cpp
  llvm/unittests/Demangle/ItaniumDemangleTest.cpp
  llvm/unittests/Demangle/OutputBufferTest.cpp

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