COMP: Disable -Warray-bounds for GCC 4.7, 4.8.

-Warray-bounds causes a number of false positives with -O3 that are cluttering up the
dashboard.

Change-Id: Ibaa23046c60ad5ffc2945b869005072292338d00
Merge topic 'gcc-array-bounds'

a06c378 COMP: Disable -Warray-bounds for GCC 4.7, 4.8.