[m-rev.] for review: group comparison and arithmetic builtin ops

[Zoltan Somogyi]

For review by anyone. The diff is with -b. This has bootchecked
in hlc.gc, asm_fast.gc.stseg, and csharp grades, and I expect to
bootcheck it in debug and deep prof grades in the next 24 hours.

Zoltan.
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