[goalc] speed up jak3 compilation #3454
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I noticed that jak 3's compilation was spending a lot of time accessing the
unordered_maps we use to store constants and symbol types.I repurposed the
EnvironmentMaporiginally made for GOOS for this. It turns out that we were copying the entire constant map whenever we encountered adeftype, and fixed that too.This speeds up jak3 compiles from ~16 to 11 seconds for me.