[vectorIntrinsics+mask] RFR: 8272479: Java API and IR changes for masked rearrange operation

[Jatin Bhateja]

- Re-organized the Java API implementation to use one common entry point of masked/non-masked vector compare operation.
 - Intrinsic side changes to absorb newly passed mask if target support predicated instructions else handled appropriately by blending full vector rearrange vector with broadcasted ZERO vector.

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Commit messages:
 - 8272479: Java API and IR changes for masked rearrange operation

Changes: https://git.openjdk.java.net/panama-vector/pull/110/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=110&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272479
  Stats: 305 lines in 41 files changed: 129 ins; 43 del; 133 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/110.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/110/head:pull/110

PR: https://git.openjdk.java.net/panama-vector/pull/110