cherry pick r216077 r216079 from upstream to workaround cortex-a53 errata
treea31a1fbf74c54af4fbb97ff99e84b0b7143d79a4
drwxr-xr-x - gcc-4_6-mobile-vtable-security
drwxr-xr-x - gcc-4_6-mobile
drwxr-xr-x - gcc-4_6
drwxr-xr-x - gcc-4_6_2-mobile
drwxr-xr-x - gcc-4_6_3-mobile
drwxr-xr-x - gcc-4_7-integration
drwxr-xr-x - gcc-4_7-mobile-vtable-verification
drwxr-xr-x - gcc-4_7-mobile
drwxr-xr-x - gcc-4_7
drwxr-xr-x - gcc-4_8
drwxr-xr-x - gcc-4_9-mobile
drwxr-xr-x - gcc-4_9
drwxr-xr-x - integration
drwxr-xr-x - main