[ARM]: Extend -mfpu options for half-precision and vfpv3xd
[ARM]: Extend -mfpu options for half-precision and vfpv3xd


Some of the the permissible ARM -mfpu options, which are supported in GCC,
are currently not present in llvm/clang.This patch adds the options:
'neon-fp16', 'vfpv3-fp16', 'vfpv3-d16-fp16', 'vfpv3xd' and 'vfpv3xd-fp16. 
These are related to half-precision floating-point and single precision.

Reviewers: rengolin, ranjeet.singh

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10764



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@240929 91177308-0d34-0410-b5e6-96231b3b80d8

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