[NewPM] Add -fsanitize={memory,thread} handling to clang

Summary: This is the missing bit to drive thread and memory sanitizers through clang using the new PassManager.

Reviewers: chandlerc, fedor.sergeev, vitalybuka, leonardchan

Subscribers: bollu, llvm-commits

Differential Revision: https://reviews.llvm.org/D56831

llvm-svn: 351423