RFR: MulAll, Neg, Abs, Blend, and improved mask support

[Lupusoru, Razvan A]

Hi everyone,

Please check out the following webrev which includes several patches from myself and my colleague Vivek:
http://cr.openjdk.java.net/~rlupusoru/panama/webrev_maskbinloadstore_02/

It includes:

*         MulAll, Neg, and Abs support for float, double, and int

*         Mask loading from boolean array is complete for all combinations

*         Blending is supported for all possible types and sizes (except 512)

*         Masked loads, stores, and several binary operations are now supported via use of blend

*         Fix for a memory ordering issue

*         Fix for rebracketing intrinsification which requires shape retention

Please take a look and let me know if you have any comments.
--Razvan