[perl #41771] Uncaught Parse Error Leads to Segfault

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This code causes a segfault:

        .sub test :main
                get_results '(0)'
        .end

>From my reading of src/ops/core.ops, this is invalid syntax.  From my reading 
of IMCC's parser, there's no easy way to catch this.  A correct invocation is 
more likely:

        .sub test :main
                get_results '(0)', P1
                # or
                get_results '()'
        .end

It's possible to add a null guard in compilers/imcc/pbc.c:1120, but I think 
that's the wrong fix; the parser should warn on the error here.

-- c