[dev.typeparams] cmd/compile: introduce named gcshape types

Still 1-1 with real types, but now with their own names!

Shape types are implicitly convertible to (and convertible from)
the types they represent.

Change-Id: I0133a8d8fbeb369380574b075a32b3c987e314d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/335170


Run-TryBot: Keith Randall <khr@golang.org>
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Dan Scales <danscales@google.com>