Pass -marm when building with ASan for Android/ARM.

Frame pointers are broken in Thumb mode.
The same reason as in 'profiling' condition several lines above.
FTR, http://llvm.org/bugs/show_bug.cgi?id=18505

BUG=325685

Review URL: https://codereview.chromium.org/143323010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246568 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246568