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Allow LdSlotArr to be hoisted across calls when the result is known to be invariant #5856

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@pleath pleath commented Dec 5, 2018

Maintain a set of stable slot syms per Func. These are the variables stored in closure contexts that are known to be invariant across calls, either LdSlotArr that is not reallocated by eval, or LdSlot symbol that is not written to by a nested function.

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:shipit:

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