Handle NetBSD alias for pthread_sigmask
Summary:
Add a new helper macro TSAN_INTERCEPTOR_NETBSD_ALIAS_THR2
that handles pthread(3)/libc aliases in scenarios when a name in both
libraries differs not just in prefix namespace.
Handle TSan pthread_sigmask mangling accordingly into __libc_thr_sigsetmask.
Reviewers: vitalybuka, joerg
Reviewed By: vitalybuka
Subscribers: kubamracek, jfb, llvm-commits, #sanitizers, mgorny
Tags: #sanitizers
Differential Revision: https://reviews.llvm.org/D53863
llvm-svn: 345627