libc: Update to latest cortexa15 memcpy code.

This uses the new code original submitted as memcpy.a15.S as
the base. However, the old code handled unaligned src/dst better
so that was spliced in. I optimized the original unaligned code by
removing a few unnecessary instructions. I optimized the a15 code by
rewriting the pre and post code. I also modified the main loop to add
a pld so that larger copies would not stall waiting for memory.

Test cases for the new memcpy:

- Copy all sized values from 0 to 1024 bytes, using whatever alignment
  is returned by malloc.
For each alignment case described below, the test copied from 0 to 128
bytes.
- Src and dst pointers are both aligned to the same value, starting
  at one going through every power of two up to and including 128.
- Src aligned to double word boundary, dst aligned to word boundary.
- Src aligned to word boundary, dst aligned to double word boundary.
- Src aligned to 16 bit boundary, dst aligned to word boundary.
- Src aligned to word boundary, dst aligned to 16 byte boundary.
- Src aligned to word boundary, dst aligned to 1 byte from a word
  boundary.
- Src aligned to word boundary, dst aligned to 2 bytes from a word
  boundary.
- Src aligned to word boundary, dst aligned to 3 bytes from a word
  boundary.
- Src aligned to 1 byte from a word boundary, dst aligned to a word
  boundary.
- Src aligned to 2 bytes from a word boundary, dst aligned to a word
  boundary.
- Src aligned to 3 bytes from a word boundary, dst aligned to a word
  boundary.

Cases to verify the unaligned source code properly aligns to a 16 bit
boundary.
- Src aligned to 1 byte from a 128 bit boundary, dst aligned to
  4 + 128 bit boundary.
- Src aligned to 1 byte from a 128 bit boundary, dst aligned to
  8 + 128 bit boundary.
- Src aligned to 1 byte from a 128 bit boundary, dst aligned to
  12 + 128 bit boundary.
- Src aligned to 1 byte from a 128 bit boundary, dst aligned to
  16 + 128 bit boundary.

In all cases, a two byte fencepost was placed at the end of the
destination to verify that only the requested number of bytes were copied.

Bug: 8005082

Merge from internal master.

(cherry-picked from commit 21ede92d794969f22cacbdb9f557818f1c5712b5)

Change-Id: Ief70c9e6dc8c6473ae245b6570b2c266fed9618c

Add missing branch in memcpy.S dst aligned case.

Merge from internal master.

(cherry-picked from commit 6ffaa931c362602a2b606a610c92326a425a876e)

Change-Id: Ifdcf01fd122866cf0d4c5b5f7a997803561d7889

Rewrite memset for cortexa15 to use strd.

Merge from internal master.

(cherry-picked from commit 7ffad9c120054eedebd5f56f8bed01144e93eafa)

Change-Id: Ia67f2a545399f4fa37b63d5634a3565e4f5482f9
libc: Optimize strcat/strcpy, small tweaks to strlen

Create one version of strcat/strcpy/strlen for cortex-a15/krait/scorpion and another
version for cortex-a9.

Tested with the libc_test strcat/strcpy/strlen tests.
Including new tests that verify that the src for strcat/strcpy do not
overread across page boundaries.

NOTE: The handling of unaligned strcpy (same code in strcat) could probably
be optimized further such that the src is read 64 bits at a time instead of
the partial reads occurring now.

strlen improves slightly since it was recently optimized.

Performance improvements for strcpy and strcat (using an empty dest string):

cortex-a9
- Small copies vary from about 5% to 20% as the size gets above 10 bytes.
- Copies >= 1024, about a 60% improvement.
- Unaligned copies, from about 40% improvement.

cortex-a15
- Most small copies exhibit a 100% improvement, a few copies only
  improve by 20%.
- Copies >= 1024, about 150% improvement.
- Unaligned copies, about 100% improvement.

krait
- Most small copies vary widely, but on average 20% improvement, then
  the performance gets better, hitting about a 100% improvement when
  copies 64 bytes of data.
- Copies >= 1024, about 100% improvement.
- When coping MBs of data, about 50% improvement.
- Unaligned copies, about 90% improvement.

As strcat destination strings get larger in size:

cortex-a9
- about 40% improvement for small dst strings (>= 32).
- about 250% improvement for dst strings >= 1024.

cortex-a15
- about 200% improvement for small dst strings (>=32).
- about 250% improvement for dst strings >= 1024.

krait
- about 25% improvement for small dst strings (>=32).
- about 100% improvement for dst strings >=1024.

Merge from internal master.

(cherry-picked from d119b7b6f48fe507088cfb98bcafa99b320fd884)

Change-Id: I296463b251ef9fab004ee4dded2793feca5b547a

Conflicts:
	libc/Android.mk
	libc/arch-arm/generic/generic.mk
	libc/arch-arm/krait/krait.mk

Fix strcpy.c that should have been strcpy.S

Merge from internal master.

(cherry-picked from 1ce665416307628f4bcaced86faa64bdf9c489c3)

Conflicts:
	libc/arch-arm/generic/generic.mk

Change-Id: I376b831df42248baadde7202a30a68112f752ff7
Fix assembler errors in generic arm strlen.c.

Tested using a static version of the strlen libc_test program
on a nexus7 that uses the generic code.

Merge from internal master.

(cherry-picked from d8d10a8994472e40d19301b7087806630877b4d5)

Change-Id: I88f7dc01dc5b5c3ac2d5580d92153bc1bc36c564
libc: Add NEON optimized memmove

ported from cm10.1

bionic-benchmarks on cortex-a9
generic:
BM_string_memmove/8    50000000         67   119.35 MiB/s
BM_string_memmove/64   10000000        175   364.59 MiB/s
BM_string_memmove/512   1000000       1078   474.86 MiB/s
BM_string_memmove/1K    1000000       2072   494.20 MiB/s
BM_string_memmove/8K     100000      16400   499.50 MiB/s
BM_string_memmove/16K     50000      32293   507.35 MiB/s
BM_string_memmove/32K     50000      66585   492.12 MiB/s
BM_string_memmove/64K     10000     160435   408.49 MiB/s

NEON-optimized:
BM_string_memmove/8   100000000         25   319.06 MiB/s
BM_string_memmove/64   50000000         43  1472.60 MiB/s
BM_string_memmove/512  10000000        247  2069.74 MiB/s
BM_string_memmove/1K    5000000        463  2210.08 MiB/s
BM_string_memmove/8K     500000       3465  2363.69 MiB/s
BM_string_memmove/16K    500000       6894  2376.30 MiB/s
BM_string_memmove/32K    100000      15490  2115.38 MiB/s
BM_string_memmove/64K     50000      42097  1556.75 MiB/s

Change-Id: I89253a01fb811438089e16320ac265177a2ca152
libc: add tegra2 TARGET_CPU_VARIANT

Tegra2 is a Dual Cortex A9 without FP neon SIMD

based on 'generic' arm (memcpy, memset)
on cortex-a15 and a8 (strcmp)
and armv7-a from cm10.1 (memchr and strlen)

rebased and now for cm-10.2 only

Change-Id: I1e7207e2d1ba02012fb5306f46b688903d31386c
Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>
Merge branch 'cm-10.2' of https://github.com/CyanogenMod/android_bionic into DJL10.2