prioritize reference id in name resolution to avoid shadowing issues #2121
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replaces #2060
fixes #2058
Prior to 0.5.0 (xref ethereum/solidity#1679), the scoping rules allow references to undeclared variables so shadowing a state variable in a function body would still prioritize the yet-declared local variable. Following 0.5.0, it is no longer possible to have forward references, and the reference will be to the state variable in the case that a shadowing local declaration is declared in predecessors of the same lexical scope.