cmd/compile/internal/reflectdata,reflect: merge MaxPtrmaskBytes const into internal/abi
For #59670
Change-Id: I5c0a463f54208db215683f11e6454d0178edda3c
GitHub-Last-Rev:
6963f3c8fb9cf34cdc8dda7ee92a58c71ca65520
GitHub-Pull-Request: golang/go#64904
Reviewed-on: https://go-review.googlesource.com/c/go/+/553275
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>