[PATCH] [AArch64] Fix v2i8->i16 bitcast legalization.

[Ahmed Bougacha]

Hi t.p.northover,

r213378 improved f16 bitcasts, so that they go directly through subregs,
instead of through the stack.  That code now causes an assertion failure
for bitcasts from other 16-bits types (most importantly v2i8).

Correct that by doing the custom lowering for i16 bitcasts only when the
input is an f16.

Part of PR21549.

http://reviews.llvm.org/D6307

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  test/CodeGen/AArch64/bitcast-v2i8.ll
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