RFR: 8281803: AArch64: Optimize masked vector NOT/AND_NOT for SVE

[Xiaohong Gong]

Currently the vector lanewise `NOT` is implemented with `"v.xor(-1)"` and `AND_NOT ` is implemented with `"v1.and(v2.xor(-1))"`. With SVE they can be respectively implemented with `"not/bic"` instructions, and we have already optimized the non-masked operations before (see [1]).

Consider the SVE also supports the `predicated` `"not/bic"`, we can apply the same optimizations for the masked `NOT/AND_NOT` by adding match rules. So this patch adds the rules for the following optimizations:

For `NOT `with int type:

  mov z16.s, #-1
  eor z18.s, p0/m, z18.s, z16.s  ==>  not z18.s, p0/m, z18.s

For `AND_NOT `with int type:

  not z16.d, p7/m, z16.d
  and z17.s, p0/m, z17.s, z16.s  ==>  bic z17.s, p0/m, z16.s

Here is the performance gain for the `"NOT/AND_NOT"` benchmarks (see [2][3] for byte type) with SVE 512-bit:

Benchmark                    Gain
LongMaxVector.NOTMasked      1.005
ShortMaxVector.NOTMasked     1.017
IntMaxVector.NOTMasked       1.022
ByteMaxVector.NOTMasked      1.023
LongMaxVector.AND_NOTMasked  1.063
IntMaxVector.AND_NOTMasked   1.047
ShortMaxVector.AND_NOTMasked 1.059
ByteMaxVector.AND_NOTMasked  1.030

[1] https://github.com/openjdk/jdk/pull/3370
[2] https://github.com/openjdk/panama-vector/blob/vectorIntrinsics/test/micro/org/openjdk/bench/jdk/incubator/vector/operation/ByteMaxVector.java#L1963
[3] https://github.com/openjdk/panama-vector/blob/vectorIntrinsics/test/micro/org/openjdk/bench/jdk/incubator/vector/operation/ByteMaxVector.java#L362

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Commit messages:
 - 8281803: AArch64: Optimize masked vector NOT/AND_NOT for SVE

Changes: https://git.openjdk.java.net/jdk/pull/7486/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7486&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281803
  Stats: 198 lines in 5 files changed: 116 ins; 0 del; 82 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7486.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7486/head:pull/7486

PR: https://git.openjdk.java.net/jdk/pull/7486