[msan] Fix print_shadow test.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@208069 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan/Win] Don't crash when ASAN_OPTIONS have disable_core=1

Reviewed at http://reviews.llvm.org/D3610

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@208070 91177308-0d34-0410-b5e6-96231b3b80d8