RFR: 8265907: JVM crashes when matching VectorMaskCmp Node [v2]

[Wang Huang]

> * fix the issue JDK-8265907

Wang Huang has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  8265907: JVM crashes when matching VectorMaskCmp Node

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3670/files
  - new: https://git.openjdk.java.net/jdk/pull/3670/files/a193ff03..44b255c1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3670&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3670&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 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