cmd/compile: internal compiler error: cannot call SetType(go.shape.int) on v (type int) [1.20 backport]

[gopherbot]

@cuonglm requested issue #59378 to be considered for backport to the next 1.20 minor release.

@gopherbot please backport this issue to go1.20, this causes code that use standard package slices stop compiling with no workaround.

[gopherbot]

Change https://go.dev/cl/482655 mentions this issue: [release-branch.go1.20] cmd/compile: don't set range expr key/value type if already set

[gopherbot]

Closed by merging 99001c4 to release-branch.go1.20.