Emit warning about infinite loop if for loop range starts with infinite value. * pt-eval.cc (execute_range_loop): Check base of range, in addition to limit of range, for infinite value and emit warning if found. * for.tst: Add tests for new behavior. Recode tests so that they don't emit warnings if file 'for.tst' is tested outside of test suite.

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[*]
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[*.{am,mk}]
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