tsan: fix handling of setjmp

It's incorrect to take address of setjmp,
because it may not (ligally) present in libc.
Fixes http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59188



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@195345 91177308-0d34-0410-b5e6-96231b3b80d8