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[AArch64] Use 64-bit movi for zeroing halfs/floats

Authored by SjoerdMeijer on Thu, Apr 1, 1:47 AM.

Description

[AArch64] Use 64-bit movi for zeroing halfs/floats

This was using the .2d variant which zeros 128 bits, but using the .2s variant
that zeros 64 bits is faster on some cores.

This is a prep step for D99586 to always using movi for zeroing floats.

Differential Revision: https://reviews.llvm.org/D99710