[m-rev.] for post-commit review: prep for representations for simple types in .int3 files

[Zoltan Somogyi]

This is step 3a of the plan I posted on Jan 29.

I am committing the diff before review because the main part
of the diff is not enabled by default, and the rest of the change
to the compiler is low risk.

For post-commit review by anyone.

Zoltan.
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