infer more completely everything that the optimizer/codegen requires #56565
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Inlining wants to know information about every isa_compileable_sig method as well as everything it might consider inlining (which is almost the same thing). So even if inference could bail on computing the type since it already reached the maximum fixed point, it should keep going to get that information. This now uses two loops here now: one to compute the inference types information, then a second loop go back and get coverage of all of the compileable targets (unless that particular target is predicted to be inlined or dropped later).
(system image size contribution seems to be fairly negligible)