[PATCH] [msan] -fsanitize-memory-track-origins=[level] flag and docs.

[Evgeniy Stepanov]

Hi kcc,

This change turns -fsanitize-memory-track-origins into -fsanitize-memory-track-origins=[level] flag (keeping the old one for compatibility). Possible levels are 0 (off), 1 (default) and 2 (incredibly detailed). See docs (part of this patch) for more info.

http://llvm-reviews.chandlerc.com/D3118

Files:
  lib/Frontend/CompilerInvocation.cpp
  lib/Driver/SanitizerArgs.cpp
  test/Driver/fsanitize.c
  include/clang/Frontend/CodeGenOptions.def
  include/clang/Driver/SanitizerArgs.h
  include/clang/Driver/Options.td
  docs/UsersManual.rst
  docs/MemorySanitizer.rst
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