ARM: move vshll NEON implementation to common code
ARM: move vshll NEON implementation to common code

Now that both ARM backends use the same implementation for vshll operations,
the code can be shared. This is also a necessary LLVM/Clang interface update.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@201094 91177308-0d34-0410-b5e6-96231b3b80d8

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