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In a Javascript file, the binder assigns a SpecialPropertyAssignment marker to the BinaryExpression node of several kinds of special assignments. Then it binds a special symbol whose declaration is that BinaryExpression node. But the symbol only applies to the left-hand side of the assignment. The right-hand side is an independent expression that should have its own symbols. Previously, symbol lookup in the checker didn't check whether a Javascript node that was part of a special property assignment came from the lhs or the rhs. So the right-hand side would also incorrectly get the special symbol intended for the left-hand side. `getSpecialPropertyAssignmentSymbolFromEntityName` in the checker now checks that its argument is the left-hand side of an assignment before returning a special property assignment symbol.