Alex Lam S.L 0f4f01b66c clean up collapse_vars (#1826) ...

- remove overlap in functionality of singular, consecutive reference of constant value
- remove workarounds for previous bugs in `lib/scope.js`
- distribute recursive `collapse_single_use_vars()` calls to their respective `OPT(AST_Node)`
- enable collapsing of variables within a single `AST_Definitions`

2017-04-18 21:45:34 +08:00

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