[m-rev.] for post-commit review: a start on getting type repn info from .int files

[Peter Wang]

On Thu, 01 Jul 2021 06:11:45 +1000 "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> As discussed on m-dev, for review by Peter when he wants.
> It is only a first draft.
> 
> Zoltan.

I've bisected the failures in the tests/invalid directory
(see http://testing.mercurylang.org) to this change:

    e627efcf501652710d4e264785282a75954cb627 is the first bad commit
    commit e627efcf501652710d4e264785282a75954cb627
    Author: Zoltan Somogyi <zoltan.somogyi at runbox.com>
    Date:   Thu Jul 1 06:12:21 2021 +1000

	A start on getting type_repn info from .int files.

The failures occur when bootchecking with this in Mmake.stage.params:

    EXTRA_MCFLAGS=-O5 --intermod-opt

Zoltan, do you want to take a look at it?

Peter