[vectorIntrinsics+mask] RFR: 8271273: Java API and IR changes for masked compare operation [v2]

[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.

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

  8271273: Review comments resolution.

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Changes:
  - all: https://git.openjdk.java.net/panama-vector/pull/103/files
  - new: https://git.openjdk.java.net/panama-vector/pull/103/files/d3a62d3d..f7a44224

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=103&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=103&range=00-01

  Stats: 406 lines in 40 files changed: 278 ins; 1 del; 127 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