RFR: 8268293: VectorAPI cast operation on mask and shuffle is broken [v4]

[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: Moving legality logic from test-generation script to java AbstractVectorTest.

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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/68107bd9..e7628a72

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4392&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4392&range=02-03

  Stats: 2789 lines in 34 files changed: 801 ins; 1490 del; 498 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