[Msan] Fix the backtrace.cc tests to build and pass on FreeBSD
Differential Revision: http://reviews.llvm.org/D9221


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@235703 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed