[PATCH] D148318: [clang-tidy] Add `performance-dont-use-endl` check

[André Schackier via Phabricator via cfe-commits]

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This check flags uses of `std::endl` on iostreams and suggests using the newline character `'\n'` instead. `std::endl` performs two operations: it writes a newline character to the output stream and then flushes the stream buffer, which can be less efficient than writing a single newline character using `'\n'`.

This fixes llvm#35321


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148318

Files:
  clang-tools-extra/clang-tidy/performance/CMakeLists.txt
  clang-tools-extra/clang-tidy/performance/DontUseEndlCheck.cpp
  clang-tools-extra/clang-tidy/performance/DontUseEndlCheck.h
  clang-tools-extra/clang-tidy/performance/PerformanceTidyModule.cpp
  clang-tools-extra/docs/ReleaseNotes.rst
  clang-tools-extra/docs/clang-tidy/checks/list.rst
  clang-tools-extra/docs/clang-tidy/checks/performance/dont-use-endl.rst
  clang-tools-extra/test/clang-tidy/checkers/performance/dont-use-endl.cpp

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