tsan: fix CPP_WEAK definition (it must be the other way around)


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@173932 91177308-0d34-0410-b5e6-96231b3b80d8
asan/tsan: manually define FUTEX constants, because <linux/futes.h> header is broken on some linux distributions


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@173933 91177308-0d34-0410-b5e6-96231b3b80d8