[vectorIntrinsics+mask] RFR: 8274236: Cleanups related to X86 masking support. [v2]

[Jatin Bhateja]

> - Re-factor and cleanup existing VectorLoadMask, VectorStoreMask and CICS patterns (one source is memory operand).

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

  8274236: Review comments resolved.

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Changes:
  - all: https://git.openjdk.java.net/panama-vector/pull/131/files
  - new: https://git.openjdk.java.net/panama-vector/pull/131/files/7fa950a2..23f3ee6e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=131&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=131&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/131.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/131/head:pull/131

PR: https://git.openjdk.java.net/panama-vector/pull/131