clang: add support for neon-vfp instructions

Change-Id: I19f566bc70e3b0c4a82942f4433c05812032f0a1
Merge tag 'android-4.4_r1' into HEAD

Android 4.4 Release 1.0

Conflicts:
	lib/Driver/Tools.cpp

Change-Id: Ib04890806c2d43f196fb28562aea6e49ab6d4418