Merge tag 'android-5.1.0_r1' into HEAD

Android 5.1.0 release 1

Conflicts:
	libc/arch-arm/arm.mk
	libc/arch-arm/krait/bionic/memcpy_base.S

Change-Id: Ia79ac57b847a5bd55818d8a7e95cc2bb39a9f570