RFR: 8368205: [TESTBUG] VectorMaskCompareNotTest.java crashes when MaxVectorSize=8 [v2]

[Martin Doerr]

> The test `VectorMaskCompareNotTest` requires 16 Byte vectors (or larger). If the machine only uses 8 Byte vectors, we get an exception in the static initializer because the code tries to use a 4 Byte vector which is unsupported (stack trace: see JBS issue [JDK-8369511](https://bugs.openjdk.org/browse/JDK-8369511)). This is an alternative to https://github.com/openjdk/jdk/pull/27749.

Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:

  Add check if flag is available.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27805/files
  - new: https://git.openjdk.org/jdk/pull/27805/files/3041e656..4af2585a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27805&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27805&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27805.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27805/head:pull/27805

PR: https://git.openjdk.org/jdk/pull/27805