[asan] Poor man's coverage that works with ASan (compiler-rt part)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@194702 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] disable CovDump on Windows for now (fails to compile)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@194703 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] unbreak dfsan, which includes sanitizer/common_interface_defs.h into internal sources (although it shoudn't)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@194704 91177308-0d34-0410-b5e6-96231b3b80d8