Alex Lam S.L 57ce5bd9e0 handle overlapped variable definitions (#1691) ...

Process variable definitions with or without assigned values against:
- `arguments`
- named function arguments
- multiple definitions within same scope

Essentially demote variable declarations with no value assignments.

Also fixed invalid use of `AST_VarDef` over `arguments` - should use a member of `AST_SymbolDeclaration` instead.

2017-03-27 01:30:21 +08:00

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