Merge "Implement pthread barrier."

diff --cc libc/Android.mk
Simple merge

diff --cc libc/libc.arm.map
Simple merge

diff --cc libc/libc.arm64.map
Simple merge

diff --cc libc/libc.map.txt
Simple merge

diff --cc libc/libc.mips.map
Simple merge

diff --cc libc/libc.mips64.map
Simple merge

diff --cc libc/libc.x86.map
Simple merge

diff --cc libc/libc.x86_64.map
Simple merge

diff --cc tests/pthread_test.cpp
index e764283,88b8a5c..e62518a
mode 100755,100644..100755
--- 1/tests/pthread_test.cpp
--- 2/tests/pthread_test.cpp
+++ b/tests/pthread_test.cpp