[PATCH] D27117: Support -color-diagnostics={auto,always,never}.

[Rui Ueyama via llvm-commits]

ruiu created this revision.
ruiu added reviewers: evgeny777, rafael, grimar.
ruiu added a subscriber: llvm-commits.

-color-diagnostics=auto is default because that's the same as
Clang's default. When color is enabled, error or warning messages
are colored like this.

  error:
  <bold>ld.lld</bold> <red>error:</red> foo.o: no such file
  
  warning:
  <bold>ld.lld</bold> <magenta>warning:</magenta> foo.o: no such file


https://reviews.llvm.org/D27117

Files:
  ELF/Config.h
  ELF/Driver.cpp
  ELF/Error.cpp
  ELF/Options.td
  test/ELF/color-diagnostics.test

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