ASTUnit: Fix a name clash in GCC builds.
ASTUnit: Fix a name clash in GCC builds.

Should fix the build. Looks like GCC 4.9 is using different scoping rules for
range-based for loops.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@228424 91177308-0d34-0410-b5e6-96231b3b80d8

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