RFR: 8265907: JVM crashes when matching VectorMaskCmp Node [v3]

[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 incrementally with one additional commit since the last revision:

  fix x86's bug

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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/44b255c1..817c8beb

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3670&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3670&range=01-02

  Stats: 5 lines in 1 file changed: 5 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