cmd/compile: make panicBounds stack frame smaller on ppc64
We're running into nosplit limits when compiled with all=-N -l.
Fixes #74910
Change-Id: I156263ae9b54ded240000001719512af86af70ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/693557 Reviewed-by: Paul Murphy <paumurph@redhat.com>
Auto-Submit: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Keith Randall <khr@google.com>