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Re: Various reworkings of PLACEHOLDER stuff


    Not all defined tree nodes are valid GIMPLE.  I don't entirely
    understand what PLACEHOLDER_EXPR/WITH_RECORD_EXPR do, but I would
    expect that the lowering pass would be able to remove them.

Unless you want to make a whole bunch of new subtypes as part of a
"lowering" pass, I don't see how.  Or why for that matter.


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