fix a FlowAnalysis bug were non-returning loops were skipped#1688

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tim-hoffman wants to merge 2 commits intosoot-oss:developfrom

tim-hoffman:BUG_FlowAnalysisMissesLoop

Commits on Jul 1, 2021

fix a FlowAnalysis bug were non-returning loops were skipped
tim-hoffman
committed
avoid duplicate adds which could lead to heap exhaustion on large methods
tim-hoffman
committed