clang-cl: Support -fsanitize=address

This exposes the -fsanitize=address option and adds the runtime library
to the link command.

Differential Revision: http://llvm-reviews.chandlerc.com/D1526

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@189389 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "CMake: Fix out-of-source build's symlinks."

This reverts commit r189371, it broke the in-source cmake build.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@189390 91177308-0d34-0410-b5e6-96231b3b80d8