cmd/compile: handle boolean and pointer relations

cmd/compile: handle boolean and pointer relations

The constant lattice for these types is pretty simple.
We no longer need the old-style facts table, as the ordering
table now has all that information.

Change-Id: If0e118c27a4de8e9bfd727b78942185c2eb50c4b
Reviewed-on: https://go-review.googlesource.com/c/go/+/599097
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>