go/types, types2: remove confusing debugging output in inference error message
When type inference cannot infer type arguments it prints the list of
inferred type arguments (often empty) at the end of the error message.
This was meant as debugging support only. Removed for now.
Eventually we should provide a better error message.
Fixes #49272.
Change-Id: I68d43a6ace91081009cab0f2fbad7bfbddf5e76b
Reviewed-on: https://go-review.googlesource.com/c/go/+/360554
Trust: Robert Griesemer <gri@golang.org>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Dan Scales <danscales@google.com>