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[AArch64][GlobalISel] Support truncstorei8/i16 w/ combine to form truncating…

Authored by aemerson on Jan 24 2021, 12:35 AM.

Description

[AArch64][GlobalISel] Support truncstorei8/i16 w/ combine to form truncating G_STOREs.

This needs some tablegen changes so that we can actually import the patterns properly.

Differential Revision: https://reviews.llvm.org/D102204