Szymon Gizler

> - Replace existing examples/xml_py to read JSON. > - Have JSON whitespace with one space indent per-level, and one line per node (I use "grep" a lot to filter...

> It looks like test_regress/t/t_constraint_xml* were removed by accident. They were superseded by test_regress/t/t_constraint_json_only*

Sqashed commits a bit and rebased on master. Opened separate PR #4831 that only adds --`json-only`. `--dump-tree-json` and gdb commands will be added by separate PR (probably this one) after...

> Opened separate PR https://github.com/verilator/verilator/pull/4831 that only adds --json-only. --dump-tree-json and gdb commands will be added by separate PR (probably this one) after https://github.com/verilator/verilator/pull/4831 #4831 was merged. I rebased this...

There is no variability run-to-run if you execute it on same machine. Before, there was some variability when you changed the number of threads, or enabled/disabled CUDA. In the worst...