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Huge performance regression from ghcjs-8.6.0.1 to ghcjs-8.10.7 #821

@tysonzero

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@tysonzero

On ghcjs-8.6.0.1 our project takes on the order of an hour or two to compile, but on ghcjs-8.10.7 it takes closer to a full day.

Memory usage may be a significant reason, as on ghcjs-8.6.0.1 memory usage generally hovers around 20GB, whereas ghcjs-8.10.7 frequently breaks past 30GB.

This is for a ~550 module ~50k LOC project, building on a 32GB memory x86 Mac.

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