[libclang] Bring CXCursor_AsmStmt back as an alias for CXCursor_GCCAsmStmt.
[libclang] Bring CXCursor_AsmStmt back as an alias for CXCursor_GCCAsmStmt.

This was renamed in r162632 which was badness because the C API needs to be stable.
rdar://12360096

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@164547 91177308-0d34-0410-b5e6-96231b3b80d8

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