Implement Object.groupBy + Map.groupBy #123
Merged
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This implements https://github.com/tc39/proposal-array-grouping
First commit turns on the array-grouping test262 feature.
Second and third commit implement Object.groupBy and Map.groupBy and update test262_errors.txt so you can see what tests they exercise.
The code is in that uncanny valley where it's both very similar but also just dissimilar enough that trying to mash it into a single method get clunky and clumsy, that's why I kept them separate.