RFR: 8265907: JVM crashes when matching VectorMaskCmp Node [v4]

[Wang Huang]

> * fix the issue JDK-8265907
> * all archs might be effected by this bug. I fixed x86 and aarch64.

Wang Huang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' into JDK-8265907
 - fix x86's bug
 - 8265907: JVM crashes when matching VectorMaskCmp Node

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3670/files
  - new: https://git.openjdk.java.net/jdk/pull/3670/files/817c8beb..ea390ec1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3670&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3670&range=02-03

  Stats: 591682 lines in 6867 files changed: 51926 ins; 521178 del; 18578 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3670.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3670/head:pull/3670

PR: https://git.openjdk.java.net/jdk/pull/3670