[vectorIntrinsics+mask] RFR: 8269343: Masked vector arithmetic intrinsics failed to be inlined randomly

[Xiaohong Gong]

The masked `"lanewise/reduceLanes"` failed to be intrinsified randomly. The main reason is the hotspot c2 compiler cannot
unbox the mask value due to the expected vector box type being mismatched with the class of the mask value. The vector box type is the` "mask class"` which is specified in Java level and saved in the intrinsic argument list. It is the class of the instance
of the vector mask (i.e. `"IntMaxMask.class"`), while the type of mask value is the super class (i.e. `"jdk.incubator.vector.VectorMask<Integer>"`).

Casting the mask value to the same subclass before calling the intrinsics can solve this issue.

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Commit messages:
 - 8269343: Masked vector arithmetic intrinsics failed to be inlined randomly

Changes: https://git.openjdk.java.net/panama-vector/pull/96/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=96&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269343
  Stats: 155 lines in 31 files changed: 0 ins; 0 del; 155 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/96.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/96/head:pull/96

PR: https://git.openjdk.java.net/panama-vector/pull/96