[PATCH][AArch64] Add support for vget/vset_lane_f16 ACLE functions

[Chad Rosier]

All,
The attached patches add support for the vget_lane_f16, vgetq_lane_f16,
vset_lane_f16, and vsetq_lane_f16 ACLEs.

I'm checking the target triple to allow for half-float arguments/return
types in Sema.  However, I'm currently looking into defining the AArch64
PCS as an alternative solution.  I was hoping we could get these patches
into the 3.4 release, so I'm sending patches with the less invasive change
for now.

 Chad

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