Revert "IRgen: Make sure any prolog instructions get debug info.", the lexical scope hasn't been set up yet so this isn't valid. It was just a cleanup to the IR, so I'm going to ignore it for now.
Revert "IRgen: Make sure any prolog instructions get debug info.", the lexical
scope hasn't been set up yet so this isn't valid. It was just a cleanup to the
IR, so I'm going to ignore it for now.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@107356 91177308-0d34-0410-b5e6-96231b3b80d8

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