[vectorIntrinsics+mask] RFR: 8271273: Java API and IR changes for masked compare 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 performing vector AND b/w comparison result and explicit mask.

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Commit messages:
 - 8271273: Correcting file permissions.
 - 8271273: Java API and IR changes for masked compare operation

Changes: https://git.openjdk.java.net/panama-vector/pull/103/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=103&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271273
  Stats: 559 lines in 42 files changed: 243 ins; 188 del; 128 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/103.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/103/head:pull/103

PR: https://git.openjdk.java.net/panama-vector/pull/103