cmd/compile: incorrect arm/arm64 simplification rules [1.17 backport]

[gopherbot]

@randall77 requested issue #48473 to be considered for backport to the next 1.17 minor release.

@gopherbot please open backport issues.

[gopherbot]

Change https://golang.org/cl/351071 mentions this issue: [release-branch.go1.17] cmd/compile: fix simplification rules on arm/arm64

[randall77]

This issue causes miscompilation. It's hard to trigger, but causes the compiler to generate wrong code if it does.

[dmitshur]

Closed by merging 644555d to release-branch.go1.17.