[vectorIntrinsics] RFR: VectorMask.intoArray intrinsics

[Mai Đặng Quân Anh]

Hi,

This small patch applies intrinsics for `VectorMask.intoArray`. This uses the existing `VectorSupport.store` with the signature changes similar to `VectorSupport.load`.
`VectorMask.intoArray` implementation is moved to each concrete class, `VectorMask.toArray` implementation is changed similar to `Vector.toArray`, avoiding referring to `getBits`.
In the hotspot, a small change is made to wrap the node in a `VectorStoreMask` node before passing it to `StoreVectorNode`, similar to how `VectorMask.fromArray` is handled there.

Thank you very much.

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Commit messages:
 - move methods to concrete classes
 - intrinsics for VectorMask.toArray

Changes: https://git.openjdk.java.net/panama-vector/pull/160/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=160&range=00
  Stats: 425 lines in 35 files changed: 410 ins; 2 del; 13 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/160.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/160/head:pull/160

PR: https://git.openjdk.java.net/panama-vector/pull/160