Merge pull request #10041 from ethereum/lValueOrdinaryUndefined

Make sure lValueOfOrdinaryAssignment does not have an undefined value.

libsolidity/ast/ASTAnnotations.h

@@ -254,7 +254,7 @@ struct ExpressionAnnotation: ASTAnnotation
 	/// Whether the expression is an lvalue that is only assigned.
 	/// Would be false for --, ++, delete, +=, -=, ....
 	/// Only relevant if isLvalue == true
-	bool lValueOfOrdinaryAssignment;
+	bool lValueOfOrdinaryAssignment = false;
 
 	/// Types and - if given - names of arguments if the expr. is a function
 	/// that is called, used for overload resolution