[PATCH] D16953: Enhance clang-tidy modernize-redundant-void-arg check to apply fixes to header files

[Richard via cfe-commits]

LegalizeAdulthood created this revision.
LegalizeAdulthood added a reviewer: alexfh.
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Update `check_clang_tidy.py` to handle fixes applied to header files by adding `--header-filter` argument that:
- Passes `-header-filter` down to `clang-tidy`
- Copies named header to temporary directory where `clang-tidy` is run
- Performs `FileCheck` checks on the header for `CHECK-MESSAGES`
- Performs `FileCheck` checks on the header for `CHECK-FIXES`

Fixes PR25894

http://reviews.llvm.org/D16953

Files:
  clang-tidy/modernize/RedundantVoidArgCheck.cpp
  test/clang-tidy/check_clang_tidy.py
  test/clang-tidy/modernize-redundant-void-arg.cpp
  test/clang-tidy/modernize-redundant-void-arg.h

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