libc: Add optimized memcpy for Cortex-A15

 * This version is from Newlib and is written/recommended by ARM as the best
   routine for Cortex-A15.

Change-Id: Ie9c2817dabda929ae4efaada5f6d467d53551ba4

Conflicts:

	libc/Android.mk
libc: Add ARMV7 optimized memchr()

 * From Cortex-Strings via Linaro
 * Performance is 10x over the default version on microbenchmarks

Change-Id: I14c1b5ccbd0078219a1dbf9f02fb1591b3a2403c
libc: Remove Scorpion memmove() routine

 * This code is slower than the new implementation under every
   circumstance on Scorpion devices. Remove it and standardize on one
   implementation.
 * Also remove "optimized" memmove_words, which was just a pointer to
   memmove. The performance was identical to the C version on Krait, and
   has regressions on other platforms. This function is only used for
   System.arraycopy in Dalvik.

Change-Id: I42d06fbd7c56d9874b80a0e768dbadf0fa5025a4
Bionic/libm: Fix the mismatch ENTRY/END in e_pow.S

Change-Id: Ibe53e7863f462a63029d1154f317256c00814c6d
libm: Check for NEON support when choosing fast pow()

Change-Id: If981f6d00325fd599e8fa975782adcd9016b5e55

Conflicts:

	libm/Android.mk
libm: Enable fast NEON pow() for supported targets

Change-Id: Iabda43e3c8462074a9a46c8f496eac903ea17084

Conflicts:

	libm/Android.mk