RFR: 8268293: VectorAPI cast operation on mask and shuffle is broken [v3]

[Jatin Bhateja]

> Existing implementation of VectoMask.cast and VectorShuffle.cast operation do not generate correct mask compliant with the species passed as the argument.
> 
> This patch fixes the implementation and adds the corresponding  cast operation test cases to VectorAPI regression suite.

Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:

  8268293: Review comments resolution.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4392/files
  - new: https://git.openjdk.java.net/jdk/pull/4392/files/21f2a229..68107bd9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4392&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4392&range=01-02

  Stats: 364 lines in 62 files changed: 301 ins; 31 del; 32 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4392.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4392/head:pull/4392

PR: https://git.openjdk.java.net/jdk/pull/4392