Port github/codeql#21202 to our fork#319

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MathiasVP wants to merge 2 commits intomainfrom

port-#21202-to-microsoft

Commits on Jan 22, 2026

C++: Add ''isLiveAtEndOfBlock' predicate to 'Definition'.
MathiasVP
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C++: Drive-by fix: Don't use the uncached ''getAPhiInputOrPriorDefinition' predicate. Instead, cache it and call it like we are supposed to.
MathiasVP
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