8339494: Porting HalfFloatVector classes.

[jatin-bhateja]

• Port existing HalfFloatVector and its concrete vector classes from vectorIntrinsics+fp16 to lworld+fp16.
• These new vector classes uses Float16 array as their backing storage.
• Idea is to enable intrinsificaiton of new HalfFloatVector operations and leverage existing Float16 auto-vectorization and backend support.

All existing VectorAPI tests are passing with the patch.

Best Regards, Jatin

Follow up work:- a) Jtreg suite extensions to cover HalfFloatVector operations. b) Handle Float16 lane type in vector API inline expansion layer.

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Issue

• JDK-8339494: Porting HalfFloatVector classes. (Enhancement - P4)

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