[lsan] When necessary, define LSan suppression for tls_get_addr.

Summary:
Generalize already defined LSan suppression for the leak on
tls_get_addr, some envs do not have the entire call stack symbolized,
so we have to be less specific.

Reviewers: eugenis

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D32545

llvm-svn: 301434