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: http://src.chromium.org/svn/trunk/src/build@246568 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -3271,6 +3271,11 @@
                           '-fuse-ld=gold',
                         ],
                       }],
+                      ['asan==1', {
+                        'cflags': [
+                          '-marm', # Required for frame pointer based stack traces.
+                        ],
+                      }],
                     ],
                   }],
                 ],