Improve model-building error messages

[asotona]

This PR improves model-building error messages and provides additional diagnostic information, including model fragments. It also enables incomplete models to be printed.

Example of the improved error message:

Use of value is not dominated by value
^block_1:
  %1 : java.type:"int" = constant @10;
  %2 : java.type:"int" = constant @11;
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ value declared here
  %3 : java.type:"int" = neg %2;
  branch ^block_3;
^block_5:
  %7 : java.type:"int" = constant @30;
  %8 : java.type:"int" = neg %2;
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ invalid use
  return;

See TestDiagnostics for more.

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Progress

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@asotona This change now passes all automated pre-integration checks.

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Improve model-building error messages

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