CL 577935 enabled hot block alignment on 386
and amd64 architecture.
However, this change broke the plan9/386 build.
This change disables AlignHot on plan9/386.
Updates #67502.
Change-Id: If73b066824c7218a9408c6e8f06aec5908b7a64f
Reviewed-on: https://go-review.googlesource.com/c/go/+/586835
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David du Colombier <0intro@gmail.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>