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: I9a999c01cea92aace9df7be9ad8f90f150040375

Conflicts:
	libm/Android.mk
libm: fix KRAIT_BIONIC_OPTIMIZATION

Fix krait mem opts again

Change-Id: I0752b8ee44c1ce6ff171fae7ac2e88de0e3d26f9