Use -O1 when testing with ASAN and MSAN to prevent Clang OOM errors.
Use -O1 when testing with ASAN and MSAN to prevent Clang OOM errors.

Currently certain tests get killed when compiled with ASAN at -O0 because
they eat all of the systems memory. This doesn't happen at -O1, so enable that
to work around the issue.


git-svn-id: 756ef344af921d95d562d9e9f9389127a89a6314@278722 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx