[PATCH] [ASan] Restrict the set of flags overriden at activation.

[Alexey Samsonov]

Hi eugenis, kcc,

Change the way ASan flag parsing is performed at activation: instead
of overwriting all ASan and common flags from the activation string,
ASan will now only override a handful of whitelisted flags.
This is a first step towards making runtime flags immutable after
initialization. I plan to re-factor the activation stragegy to
the following one:

  - Parse commandline flags. Override the defaults from compile
    definition, env var, etc. Flags are immutable at this point.
  - Initiailize the runtime from commandline flags.
  - If ASan needs to be started deactivated, stash the runtime
    state in "asan_deactivated_flags" and deactivate the runtime.
  - When ASan is activated, override "asan_deactivated_flags" with
    activation flags, and use it to re-activate the runtime.

http://reviews.llvm.org/D6709

Files:
  lib/asan/asan_activation.cc

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