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[X86][AVX512] Choose correct registers in vpbroadcastb/w

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[X86][AVX512] Choose correct registers in vpbroadcastb/w

Fixes the vpbroadcastb/w instructions which use GPRs as source operands, to use the correct registers.
The full GPR should be used, and not the subregister, as it happens before the patch.

Fixes pr33795

Differential Revision:
https://reviews.llvm.org/D36479

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