[sanitizer] A bunch of libc interceptors.

sigwait
sigwaitinfo
sigtimedwait
sigemptyset
sigfillset
sigpending
sigprocmask


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@191374 91177308-0d34-0410-b5e6-96231b3b80d8