Remember failed globals so we don't hit assertions

[dcodeIO]

An alternative to fix #1205 by remembering globals that failed to compile so we properly get a false upon subsequent compileGlobal invocations and don't run into asserts in the first place, as per my latest comment on the above PR.

@DuncanUszkay1: Can you confirm that this solves the issue as well?

If so, also fixes #1165

Now also: fixes #1186, fixes #1190

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[DuncanUszkay1]

LGTM, seems to fix the issue I had

[dcodeIO]

Last commit is an attempt to also fix cases like

let a = (a = 4, 3)

on top of this, by reusing the set of pending globals in compilation to check for this condition. I'm not particularly proud of the dummy local that must be added for this, but it fixes the problem so I guess it's fine.

[dcodeIO]

Merging to get it out of the way, but might not catch all cases yet. Let me know if there's something missing, can add it in a follow-up.