[m-rev.] for post-commit review: use_module decls only for used modules in .int2 files

[Zoltan Somogyi]

For review by anyone.

This has no effect on systems maintained with --warn-unused-imports
such as the compiler, but will have an effect on other programs.

In the unlikely case that there are any problems, you can disable the
new algorithm and fall back to the algorithm we used before Aug 7
by specifying --no-experiment4.

Zoltan.
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