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[MC][SVE] Fix data operand for instruction alias of `st1d`.

Authored by fpetrogalli on Aug 26 2020, 8:43 AM.

Description

[MC][SVE] Fix data operand for instruction alias of st1d.

The version of st1d that operates with vector plus immediate
addressing mode uses the alias st1d { <Zn>.d }, <Pg>, [<Za>.d] for
rendering st1d { <Zn>.d }, <Pg>, [<Za>.d, #0]. The disassembler was
generating <Zn>.s instead of <Zn>.d>.

Differential Revision: https://reviews.llvm.org/D86633