Extract/Insert Java API Modifications for VectorAPI

[Rukmannagari, Shravya]

Hi All,
Please find the webrev below which modifies the definition of extract and insert. These are currently intrinsified on x86 platforms for a constant value idx, whereas the API provides a runtime variable to the function call.
http://cr.openjdk.java.net/~srukmannagar/VectorAPI_vectorExtractInsert/webrev.01/

Thanks,
Shravya.