RFR: 8255448: Fastdebug JVM crashes with Vector API when PrintAssembly is turned on [v4]

[Dongbo He]

> 8255448: Fastdebug JVM crashes with Vector API when PrintAssembly is turned on

Dongbo He has updated the pull request incrementally with one additional commit since the last revision:

  Simplified code

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/853/files
  - new: https://git.openjdk.java.net/jdk/pull/853/files/12318bd4..e72ffde4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=853&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=853&range=02-03

  Stats: 13 lines in 1 file changed: 4 ins; 8 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/853.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/853/head:pull/853

PR: https://git.openjdk.java.net/jdk/pull/853