RFR: 8264109: Add vectorized implementation for VectorMask.andNot() [v2]

[Xiaohong Gong]

> Currently "VectorMask.andNot()" is not vectorized:
>     public VectorMask<E> andNot(VectorMask<E> m) {
>         // FIXME: Generate good code here.
>         return bOp(m, (i, a, b) -> a && !b);
>     }
> This can be implemented with` "and(m.not())" `directly. Since `"VectorMask.and()/not()" `have been vectorized in hotspot, `"andNot"`
> can be vectorized as well by calling them.
> 
> The performance gain is >100% for such a simple JMH:
>   @Benchmark
>   public Object andNot(Blackhole bh) {
>     boolean[] mask = fm.apply(SPECIES.length());
>     boolean[] r = fmt.apply(SPECIES.length());
>     VectorMask<Byte> rm = VectorMask.fromArray(SPECIES, r, 0);
> 
>     for (int ic = 0; ic < INVOC_COUNT; ic++) {
>       for (int i = 0; i < mask.length; i += SPECIES.length()) {
>         VectorMask<Byte> vmask = VectorMask.fromArray(SPECIES, mask, i);
>           rm = rm.andNot(vmask);
>         }
>     }
>     return rm;
>   }

Xiaohong Gong has updated the pull request incrementally with one additional commit since the last revision:

  Move the changing to AbstractMask.andNot and revert changes in VectorMask
  
  Change-Id: Ie3ec8f53cb24526c8e1ccc68038355d024910818
  CustomizedGitHooks: yes

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3211/files
  - new: https://git.openjdk.java.net/jdk/pull/3211/files/ccb73d92..33ac041e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3211&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3211&range=00-01

  Stats: 9 lines in 2 files changed: 5 ins; 2 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3211.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3211/head:pull/3211

PR: https://git.openjdk.java.net/jdk/pull/3211