Modules: follow up to r276769.
Modules: follow up to r276769.

In r276769, I forgot to forward the driver option, add that here.

rdar://26675801


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@276797 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang