[vectorIntrinsics+mask] RFR: 8270264: Add the masking support for vector lanewiseShift

[Xiaohong Gong]

This patch adds the masking support for "`lanewiseShift`" vector API. Originally there is no masked operation for this API,
adding the masked version for it can benefit the masked binary "`lanewise`" that has a shift op and a constant input like:

  ByteVector lanewise(VectorOperators.Binary op,
                      byte e,
                      VectorMask<Byte> m)

To support it, this patch adds the mask information to the original intrinsic methods which are called both by masked and
non-masked `lanewiseShift` operations. For non-masked operations, the mask class and value are set to null.

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Commit messages:
 - 8270264: Add the masking support for vector lanewiseShift

Changes: https://git.openjdk.java.net/panama-vector/pull/97/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=97&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270264
  Stats: 496 lines in 29 files changed: 397 ins; 52 del; 47 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/97.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/97/head:pull/97

PR: https://git.openjdk.java.net/panama-vector/pull/97