C++: Fix C++20 concept related class extensions #20026
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Pull Request Overview
This PR fixes C++20 concept-related class extensions in the CodeQL library by correcting the inheritance hierarchy for requirement expressions. The changes ensure that all requirement expression classes properly inherit from RequirementExpr and eliminate redundant parent checks.
Key changes:
- Adds constructor logic to
RequirementExprto establish proper parent-child relationships - Refactors requirement expression classes to use the base class constructor instead of duplicating parent checks
- Corrects the inheritance hierarchy for
NestedRequirementExprandConceptIdExpr
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Noted by @MathiasVP on Slack.
RequirementExprwas missing a charpred, or wasn't abstract. I added a charpred.NestedRequirementExpraccidentally didn't extendRequirementExprConceptIdExpraccidentally did extendRequirementExpr(while it can occur in other contexts)