8140450: Implement JEP 259: Stack-Walking API Reviewed-by: coleenp, dfuchs, bchristi, psandoz, sspitsyn Contributed-by: Mandy Chung <mandy.chung@oracle.com>, Brent Christian <brent.christian@oracle.com>, Daniel Fuchs <daniel.fuchs@oracle.com>, Hamlin Li <huaming.li@oracle.com>

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