Reloading modules leaks memory

[MikhailArkhipov]

Clone dups.
Open it
Open few files, do some random go to definitions.
Leave product inactive

Observe RAM growth and some odd module reloading

[heyakyra]

Found this bug via microsoft/vscode-python#2594

Is there a workaround for this? I'm basically blocked at work because all 16G ram + 8G swap gets completely consumed after half an hour of editing

[MikhailArkhipov]

@heyakyra - you are probably hitting #193. This one is not too bad.

[MikhailArkhipov]

Depends on #209