cmd/compile: internal compiler error with zero-size types [1.22 backport]

[gopherbot]

@dr2chase requested issue #65808 to be considered for backport to the next 1.22 minor release.

@gopherbot please consider this for backport to 1.22; it is likely a regression from the expand_calls cleanup.

I tested the backport already, the fix is targeted, low risk, and applies clean.

[dr2chase]

This IS a regression from 1.21, and does not need to be backported to 1.21 also.

[gopherbot]

Change https://go.dev/cl/601195 mentions this issue: [release-branch.go1.22] cmd/compile: add 0-sized-value simplification to copyelim

[gopherbot]

Closed by merging CL 601195 (commit 8c8adff) to release-branch.go1.22.