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

[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.

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Commit messages:
 - 8268293: Chaining gen-tests.sh file permissions.
 - 8268293: VectorAPI cast operation on mask and shuffle is broken

Changes: https://git.openjdk.java.net/jdk/pull/4392/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4392&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268293
  Stats: 3470 lines in 65 files changed: 2249 ins; 886 del; 335 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