cmd/compile: typebits.Set: invalid initial alignment: type Peer has alignment 8, but offset is 4 [1.19 backport]

[gopherbot]

@cherrymui requested issue #54991 to be considered for backport to the next 1.19 minor release.

SGTM for backporting.

@gopherbot please backport this to Go 1.19 . This causes valid program fail to compile.

[gopherbot]

Change https://go.dev/cl/431895 mentions this issue: [release-branch.go1.19] cmd/compile/internal/typebits: relax alignment check

[laboger]

This change causes build errors on ppc64le on master with Openshift. Please hold off on backporting. I have asked the testers to open an issue with reproducer information.

[mkumatag]

This change causes build errors on ppc64le on master with Openshift. Please hold off on backporting. I have asked the testers to open an issue with reproducer information.

#55254 here is the issue created

[cuonglm]

Not related to this issue, since when the last known good commit is 7db923f, which was after this one.

[gopherbot]

Closed by merging 2614985 to release-branch.go1.19.