[vector] swizzle intrinsic

[Deshpande, Vivek R]

Hi All

I would like to contribute a patch which generates intrinsics for swizzle operation for all the types.
For bytes it generates intrinsic code for 64 bits and 128 bits and for shorts it generates for 64, 128 and 256 bits.
The reason for not adding support for those sizes is, the Shuffle vector size is more than 512 bits
and support can be added later with more complex code.
For rest of the types it generates intrinsics for all the sizes.

Webrev:
http://cr.openjdk.java.net/~vdeshpande/VectorAPI_swizzle/webrev.00/

Regards,
Vivek