[driver - crash diagnostics] Convert the flags back to an array of strings and use array_lengthof.  Also, append the new filename with correct preprocessed suffix. Last part of rdar://11285725
[driver - crash diagnostics] Convert the flags back to an array of strings and use
array_lengthof.  Also, append the new filename with correct preprocessed suffix.
Last part of rdar://11285725


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@156117 91177308-0d34-0410-b5e6-96231b3b80d8

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