llvm: Fix for GCC 4.8

GCC 4.8 miscompiles DataLayout::parseSpecifier under O2 and higher,
which results in a SIGBUS.  This can be easily reproduced by using
Google Camera blur effect.  It crashes in the render phase.

Change-Id: I7646f17333b3bb8d0fe3f820fdc863b1f1d46c80