Update all debug directives.

The libcorkscrew stack unwinder does not understand cfi directives,
so add .save directives so that it can function properly.

Also add the directives in to strcmp.S and fix a missing set of
directives in cortex-a9/memcpy_base.S.

Bug: 10345269

Merge from internal master.

(cherry-picked from 5f7ccea3ffab05aeceecb85c821003cf580630d3)

Change-Id: If48a216203216a643807f5d61906015984987189
Merge "Update all debug directives."
Fix all debug directives.

The backtrace when a fortify check failed was not correct. This change
adds all of the necessary directives to get a correct backtrace.

Fix the strcmp directives and change all labels to local labels.

Testing:
- Verify that the runtime can decode the stack for __memcpy_chk, __memset_chk,
  __strcpy_chk, __strcat_chk fortify failures.
- Verify that gdb can decode the stack properly when hitting a fortify check.
- Verify that the runtime can decode the stack for a seg fault for all of the
  _chk functions and for memcpy/memset.
- Verify that gdb can decode the stack for a seg fault for all of the _chk
  functions and for memcpy/memset.
- Verify that the runtime can decode the stack for a seg fault for strcmp.
- Verify that gdb can decode the stack for a seg fault in strcmp.

Bug: 10342460
Bug: 10345269

Merge from internal master.

(cherry-picked from 05332f2ce7e542d32ff4d5cd9f60248ad71fbf0d)

Change-Id: Ibc919b117cfe72b9ae97e35bd48185477177c5ca
Merge "Fix all debug directives."
__memcpy_chk: Fix signed cmp of unsigned values.

I accidentally did a signed comparison of the size_t values passed in
for three of the _chk functions. Changing them to unsigned compares.

Add three new tests to verify this failure is fixed.

Bug: 10691831

Merge from internal master.

(cherry-picked from 883ef2499c2ff76605f73b1240f719ca6282e554)

Change-Id: Id9a96b549435f5d9b61dc132cf1082e0e30889f5
Merge "__memcpy_chk: Fix signed cmp of unsigned values."
Merge https://android.googlesource.com/platform/bionic into jb-devel-mr2-release