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[VectorCombine] limit load+insert transform to one-use

Authored by spatel on Sep 17 2020, 11:22 AM.

Description

[VectorCombine] limit load+insert transform to one-use

As discussed in:
https://llvm.org/PR47558
...there are several potential fixes/follow-ups visible
in the test case, but this is the quickest and safest
fix of the perf regression.

Details