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[GlobalISel] Add translation support for vector reduction intrinsics.

Authored by aemerson on Oct 8 2020, 12:17 AM.

Description

[GlobalISel] Add translation support for vector reduction intrinsics.

In order to prevent the ExpandReductions pass from expanding some intrinsics
before they get to codegen, I had to add a -disable-expand-reductions flag
for testing purposes.

Differential Revision: https://reviews.llvm.org/D89028