[Sanitizer] Don't #include the same system header twice.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201071 91177308-0d34-0410-b5e6-96231b3b80d8
[msan] Return EINVAL instead of crashing from mmap of an invalid address.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201074 91177308-0d34-0410-b5e6-96231b3b80d8