[AArch64] Refactor the Neon vector/scalar floating-point convert implementation. Specifically, reuse the ARM intrinsics when possible.
[AArch64] Refactor the Neon vector/scalar floating-point convert implementation.
Specifically, reuse the ARM intrinsics when possible.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@196927 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,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang