[msan] Fix origin propagation for select of floats.

MSan does not assign origin for instrumentation temps (i.e. the ones that do
not come from the application code), but "select" instrumentation erroneously
tried to use one of those.

https://code.google.com/p/memory-sanitizer/issues/detail?id=78


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@222918 91177308-0d34-0410-b5e6-96231b3b80d8
[Msan] Generalize mapping facilities to add FreeBSD support
Differential Revision: http://reviews.llvm.org/D6387


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@222919 91177308-0d34-0410-b5e6-96231b3b80d8