[TSan] Fix static TLS boundaries calculations in __tls_get_addr interceptor.

Summary:
DTLS_on_tls_get_addr expects (tls_addr + tls_size) as the last
parameter, static_tls_end.

Reviewers: dvyukov

Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits

Differential Revision: https://reviews.llvm.org/D43325

llvm-svn: 325276