cmd/compile: SIGBUS unaligned access on mips64 via qemu-mips64 [1.22 backport]

[randall77]

@randall77 requested issue #67160 to be considered for backport to the next 1.22 minor release.

This is a bug that miscompiles some type equality functions on architectures that can't do unaligned loads. There is no easy workaround.

(Backport issue created manually.)

[gopherbot]

Change https://go.dev/cl/583417 mentions this issue: [release-branch.go1.22] cmd/compile: don't combine loads in generated equality functions

[gopherbot]

Closed by merging 9d2e285 to release-branch.go1.22.

[cherrymui]

CL submitted reverted. Reopen for cherry-pick review (the dashboard only shows open issues).

[gopherbot]

Change https://go.dev/cl/583798 mentions this issue: [release-branch.go1.22] cmd/compile: don't combine loads in generated equality functions