[release-branch.go1.22] cmd/compile: don't combine loads in generated equality functions
... if the architecture can't do unaligned loads.
We already handle this in a few places, but this particular place
was added in CL 399542 and missed this additional restriction.
Fixes #67212
(Reroll of CL 583417)
Change-Id: I8ee74909341e0af0d51d3761e17ff92e744ecd38
Reviewed-on: https://go-review.googlesource.com/c/go/+/583798 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>