New pseudo instruction CodeBuilder.setDebugOption

[Øystein Myhre Andersen]

*Proposal:*

Add a new  pseudo instruction:
     CodeBuilder.setDebugOption(int kind, int level)

Meaning:
kind == 1 // CodeListing
             2 .. n  // Reserved

when kind == 1
level == 0 // Off
              1 // code listing as when "stack size mismatch" error.
              2 // with additional Thread.dumpstack();
              3 .. n  // Reserved

Or something like it.

*Motivation:*

I am building a code generator for the Open Source Simula
<https://portablesimula.github.io/github.io/> compiler.

During debugging, it would be nice to be able to see the code that is
generated and possibly where the individual instructions were generated
from.

This is particularly interesting for errors such as: "stack size mismatch",
"operand stack underflow", etc.
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