Add support to create flame graph with JFR call stack sequence#22

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richardqiao2000 wants to merge 4 commits intochrishantha:mainfrom

richardqiao2000:master

Commits on Aug 6, 2020

Reverse call stacks so that it can show JFR style graph(bottom-up)
Richard Qiao
committed
add test
Richard Qiao
committed
check not needed
Richard Qiao
committed

Commits on Aug 13, 2020

fix issue that json doesn't count correctly for tlab and heap
Richard Qiao
committed