[Sanitizer/ASan tests] Automatically detect the presence of libstdc++

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@208695 91177308-0d34-0410-b5e6-96231b3b80d8
[Sanitizer tests] Add sanitizer_test_config.h to make the inclusion of gtest.h conditional

Reviewed at http://reviews.llvm.org/D3744

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@208696 91177308-0d34-0410-b5e6-96231b3b80d8
[Sanitizer tests] Land the sanitizer twin of the asan-only change r208682

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@208697 91177308-0d34-0410-b5e6-96231b3b80d8
[Sanitizer tests] Exclude three tests that fail on Windows

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@208698 91177308-0d34-0410-b5e6-96231b3b80d8