Upgrade gcc-4.7.1 to gcc-4.7.2 (with vtable verification functionality, but disabled).

This cl syncs master branch to svn google/gcc-4_7-mobile@196691 (with
vtable verification functionality, but disabled).  Note, after this
CL, the master and cros/gcc.gnu.org/branches/google/gcc-4_7-mobile
will be the same.

TEST=cbuildbot -g "45649" chromiumos-sdk x86-alex lumpy-release daisy-release amd64-generic-full arm-generic-full x86-generic-full daisy-paladin alex-paladin lumpy-paladin / pyautoperf, bootperf, bvt
BUG=None

Change-Id: Ifaeafbfc8d5b0ba31c7e6750d50eb2fde54d0044
Reviewed-on: https://gerrit.chromium.org/gerrit/45649
Reviewed-by: Bhaskar Janakiraman <[email protected]>
Tested-by: Han Shen <[email protected]>
Reviewed-by: Mike Frysinger <[email protected]>
Reviewed-by: David James <[email protected]>
Commit-Queue: Han Shen <[email protected]>
Reviewed-by: Han Shen <[email protected]>
1300 files changed