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[PowerPC] Exploit xxspltiw and xxspltidp instructions

Authored by anil9 on Jul 1 2020, 12:16 PM.

Description

[PowerPC] Exploit xxspltiw and xxspltidp instructions

Exploits the VSX Vector Splat Immediate Word and
VSX Vector Splat Immediate Double Precision instructions:

xxspltiw XT,IMM32
xxspltidp XT,IMM32

Differential Revision: https://reviews.llvm.org/D82911