[DynInst_API:] COMMIT: Merge changes in parsing

[Xiaozhu Meng <xmeng@xxxxxxxxxxx>]

This commit merges my various changes in parsing to master, including
machine learning based gap parsing, new jump table analysis and fixes
to our existing tail call heuristics.

It also includes changes made to slicing code to support the new jump
table analysis, where users now have a better control to stop slicing
when their analysis has achieved their goals and can choose to include
control flow dependencies into slice. Lastly, the ParseAPI manual is
updated accordingly.

Thanks

--Xiaozhu