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cmd/compile: improve performance for LoweredMove on ppc64x #19785

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@laboger

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go tip

What operating system and processor architecture are you using (go env)?

Ubuntu 16.04 ppc64le

In comparing performance between go 1.7 and 1.8 on ppc64le, there were some degradations found related to the SSA implementation for LoweredMove. I have a change to improve its performance for both ppc64le & ppc64.

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