Erik Desjardins bca170ad79 Avoid duplicating impure expressions in object rest destructuring (#5151) ...

* avoid duplicating impure initializers in object rest destructuring

* reuse existing VariableDeclarations in object rest destructuring, to fix two issues:

1. inserting an additional VariableDeclaration after the current one may change order of operations, which is unsafe if a future VariableDeclarator refers to a destructured variable.

2. The entire VariableDeclaration is removed when all properties are rest properties, indiscriminately removing other variables

2017-01-18 21:32:44 -05:00

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