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

[Alexey Samsonov]

================
Comment at: lib/sanitizer_common/sanitizer_flags.h:91
@@ +90,3 @@
+// time).
+#define OVERRIDE_COMMON_FLAG(flag, value) \
+    common_flags_dont_use.flag = value
----------------
kcc wrote:
> Macro in a header file? You got to be kidding. 
Replaced it with "OverrideCommonFlags()" function. Unfortunately, we can't atomically switch common_flags_dont_use singleton during tool initialization, and have to gradually update it by calls to SetCommonFlagsDefaults(), OverrideCommonFlags() and ParseCommonFlagsFromString().

http://reviews.llvm.org/D6741

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