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[PowerPC] Implement patterns for PC-Rel zextload/extload byte loads

Authored by amyk on Mar 4 2021, 9:43 PM.

Description

[PowerPC] Implement patterns for PC-Rel zextload/extload byte loads

This patch adds patterns to select the PC-Relative extloadi1 and zextloadi1 byte loads.

Differential Revision: https://reviews.llvm.org/D98042