cmd/compile/internal/typecheck: remove getcallerpc/sp builtin signature

cmd/compile/internal/typecheck: remove getcallerpc/sp builtin signature

The compiler never does a lookup of these (LookupRuntime), so they
aren't needed here.

getcallerpc is only used in intrinsification. getcallersp is used in
intrinsification and defer handling via a direct OGETCALLERSP op.

For #54766.

Change-Id: I1666ceef3360a84573ae5b41b1c51d9205de7235
Reviewed-on: https://go-review.googlesource.com/c/go/+/613495
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>