Java: Add models for StrBuilder's fluent methods #5383
Merged
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Based on #5372 -- only review the last 3 commits here.This includes adding a hook at the top of additionalLocalTaintStep to take(done in #5413)inX -taint-> inY and inY -value-> outZto implyinX -taint-> outZand similarlyinX -taint-> outZ and inY -value-> outZimpliesinX -taint-> inY. I did this at the top level because this makes the behaviour uniform across all the different ways a MethodAccess can gain a taint step that crosses the callsite; testing onelasticsearchshowed a reasonable join order, so the additional taint edges were acceptably cheap to compute (<1s to compute the additional edges predicate vs. a total runtime of around 15 minutes).