[PATCH] Add some missing intrinsics like vmull_high_n_s16 and friends

[Jiangning Liu]

Hi t.p.northover,

This patch is to cover a couple of missing intrinsics like vmull_high_n_s16 and friends.

All the patterns for mull/mla/mls/fma/fms/... are moved to a location close to the end of the .td file, because 
1) The newly added patterns should be put together with the similar pattern class.
2) The newly added patterns depends on SCALAR related patterns.

http://llvm-reviews.chandlerc.com/D2301

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64InstrNEON.td
  test/CodeGen/AArch64/neon-2velem-high.ll
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