[asan] Remove the local copy of Android ucontext.h.

This header is present in the r10c release of the NDK.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@222915 91177308-0d34-0410-b5e6-96231b3b80d8
[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
Merge branch 'master', remote-tracking branch 'trunk/master'