[opaque pointer type] Explicitly specify some types for GEP
[opaque pointer type] Explicitly specify some types for GEP

Not all of them (there's still a fallback for this specific function
that omits the type parameter) but it's some I bothered to do now.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@234063 91177308-0d34-0410-b5e6-96231b3b80d8

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