[vectorIntrinsics+mask] RFR: 8274342: AArch64: [vector] AArch64 SVE backend code cleanup

[Eric Liu]

This patch refactors AArch64 SVE backend codes with merging some rules
into C2_MacroAssembler. As the input of VectorMaskOp changed after
JDK-8273949, this patch fixes the backend to support using predicate
register as input.

The size of libjvm.so reduces about 100KB after this patch.

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

Commit messages:
 - 8274342: AArch64: [vector] AArch64 SVE backend code cleanup

Changes: https://git.openjdk.java.net/panama-vector/pull/134/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=134&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274342
  Stats: 1382 lines in 6 files changed: 140 ins; 734 del; 508 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/134.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/134/head:pull/134

PR: https://git.openjdk.java.net/panama-vector/pull/134