[EASY] raise recursion limit
[EASY] raise recursion limit

Summary: Turns out we have legit recursion depths > 10000 on
non-pathological code (!!). Need to track those down
and restructure the algo to avoid, but meanwhile, this diff
raises the limit to 1,000,000.

Reviewed By: @avikchaudhuri

Differential Revision: D2143167

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