[m-rev.] for review: generate warnings only when generating code

[Zoltan Somogyi]

For review of the concept by anyone. (The implementation
is straightforward.)

I wrote this because the warnings you get when the compiler
is generating interface or optimization files are in a sense
too early. One, they get put on standard output, not in the
module's .err file, and two, if halt-at-warn is specified, they stop
an invocation of make after the first module that has warnings.

Zoltan.
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