[PATCH] [Sanitizer] Make CommonFlags immutable after initialization.

[Alexey Samsonov]

Hi kcc, eugenis, glider,

Protect CommonFlags singleton by adding const qualifier to
common_flags() accessor. The only ways to modify the flags are
SetCommonFlagsDefaults(), ParseCommonFlagsFromString() functions
and OVERRIDE_COMMON_FLAG macro, which are only supposed to be
called during initialization.

http://reviews.llvm.org/D6741

Files:
  lib/asan/asan_flags.cc
  lib/lsan/lsan_common.cc
  lib/msan/msan.cc
  lib/sanitizer_common/sanitizer_flags.h
  lib/tsan/dd/dd_rtl.cc
  lib/tsan/rtl/tsan_flags.cc
  lib/ubsan/ubsan_flags.cc

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