Fix the names of the v[r]addhn and v[r]subhn Neon intrinsics. Their suffixes are supposed to reflect the source operand element type, not the destination element type.  Radar 8746481.
Fix the names of the v[r]addhn and v[r]subhn Neon intrinsics.
Their suffixes are supposed to reflect the source operand element type,
not the destination element type.  Radar 8746481.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@121392 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,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang