Add NullCheckInstanceofOperation (java:S4201)#157
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Removes redundant null checks alongside instanceof, since instanceof already returns false for null. Handles all operand orderings and the negated form (x == null || !(x instanceof Foo)), including within larger && / || chains. Adds InfixExpression support to ClassVisitor to enable operations on binary expressions. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Removes redundant null checks alongside instanceof, since instanceof already returns false for null. Handles all operand orderings and the negated form (x == null || !(x instanceof Foo)), including within larger && / || chains. Adds InfixExpression support to ClassVisitor to enable operations on binary expressions.