Add '-emit-pth' option to clang-cc as an alternate API for the high-level driver to generate PTH files. Soon we will remove from clang-cc the GCC-style '-x c-header' interface for generating PTH files and push this logic to 'clang'.
Add '-emit-pth' option to clang-cc as an alternate API for the high-level driver
to generate PTH files. Soon we will remove from clang-cc the GCC-style '-x
c-header' interface for generating PTH files and push this logic to 'clang'.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@68164 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,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang