Driver: Pass -ivfsoverlay to module crashdumps

When we create a crashdump involving modules, we build a VFS to
reproduce the problem with. This updates the reproduction script to
use that VFS.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211876 91177308-0d34-0410-b5e6-96231b3b80d8