7144296: PS: Optimize nmethods processing Summary: Prunes scavenge roots in code list every young GC, promote objects directly pointed by the code immediately Reviewed-by: johnc, jcoomes

Merge

7140866: assert(covered) failed: Card for end of new region not committed Summary: resize covered region only after successfully mapping shared archive Reviewed-by: brutisso, ysr Contributed-by: dean.long@oracle.com