Use kernel default for initial thread size

Bug: 10697851

Change-Id: I8d980f5e0b584799536f6e6b891056c968d26cdf
Simplify main thread stack size initialization

Change-Id: Iec09433d9de501031cce09dc75848a5e8f3d96bf

Conflicts:
	libc/bionic/pthread_attr.cpp
	libc/bionic/pthread_internal.h
libc: switch to C11 and C++11

with gnuism support

Change-Id: Ic42199b4adc45b8bbe8cf07eff2ca8931beb5f14
tests: memcmp and memcpy unaligned benchmarks

Unaligned benchmarks for memcmp and memcpy were missing.
These are basic and aggressively unaligned by +10/+13.

Change-Id: I0ce081f155b4288a0d41aad0399298bf2834ec4d