[ASan] Build ASan on Windows only if MSVC is used

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@194963 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] support __hppa__ (by John David Anglin)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@194995 91177308-0d34-0410-b5e6-96231b3b80d8