CFI: Move STL allocator blacklist to clang
The regular expression to match STL allocators can't easily account for
C++ mangling compression and fails to match some valid instances of STL
allocators. Perform this logic in clang instead.
Motivated by crbug.com/751385.
Reviewers: pcc, kcc, llvm-commits
Reviewed By: pcc
Differential Revision: https://reviews.llvm.org/D36291