[ARM] libc: define return and conditional return macros

Summary: Required by the new strncat, strlcat, strncmp, and strnlen

Test Plan: verified

Reviewers: randall.rushing, jriordan001, anders3408, synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D239
libm: Squashed CAF sin/cos implementation for ARM NEON

Summary:
Bionic/libm: Add precision-correct de-serialize sin/cos.

Modify sin/cos to improve performance while retaining bit-for-bit
accuracy with existing algorithm.

Change-Id: Iaba2dd731cd015732744705dad8bddb713b43067
(cherry picked from commit df55e67573e176042c5d2ae084c758bc2e9e0025)
(cherry picked from commit 6a688d7aa4512731c430673ccd4f0d6e3999d439)
(cherry picked from commit 47bb7bc2962bff835000dca016f6319c20734398)

Bionic/libm: add assembly versions of sin/cos.

Add assembly versions of sin/cos with integrated remainder pi/2
calculation.  Directly extracted from binary libm.so compiled with
__ieee754_rem_pio2 calls inlined.

Change-Id: Ia093f420e58e794635e3a5f09e8236ae7601f1f6
(cherry picked from commit 19a356a1ed6384a9161739d5833cf5cfd88a8d3b)
(cherry picked from commit 1c9bdcfa6a68cd1a13a1e3b1a51616bddffeefad)
(cherry picked from commit cdaad8ab61325e958926b57a6a726d0cfa6f7511)

Bionic/libm: Remove extra vmov from sin/cos.

Move integer representations of x bits on the integer side rather
than moving them to and from the FP registers.

Change-Id: I1895db385c9616cdae9ab6403f392dfbae292adc
(cherry picked from commit 1d0c5a9fe67141515fa54403d985828590f9c206)
(cherry picked from commit ca46b68c30cf470464ffac530b8bdba242cc5c17)
(cherry picked from commit d7acb8827620ab7331995e843fd79015aed84996)

Test Plan: testing

Reviewers: jriordan001, randall.rushing, synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D270
libm:also use optimized sqrt/sqrtf on ARM NEON

Summary: Depends on D270 and stacks on top. Fixed from initial patch that was reverted

Test Plan: verified

Reviewers: randall.rushing, jriordan001

Differential Revision: http://review.codefirex.com/D271