C++: Fix unintended conflation in a taint step#21622

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MathiasVP wants to merge 2 commits intogithub:mainfrom

MathiasVP:fix-taint-conflation

Commits on Mar 31, 2026

C++: Restrict a default taint step to only add flow from the index to the result. Previously, it would add spurious flow from the base to the result as well.
MathiasVP
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C++: Accept test changes.
MathiasVP
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