[jdk17u-dev] RFR: 8274855: vectorapi tests failing with assert(!vbox->is_Phi()) failed

[Martin Doerr]

Basically clean backport of JDK-8274855. Removal from ProblemList does not apply because vectorapi tests are not problem listed in 17 (JDK-8274920 not in 17).

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Commit messages:
 - Backport 5021a12ceada3192e81e2c06b556e7c80cd6cf31

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/193/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=193&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274855
  Stats: 15 lines in 1 file changed: 15 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/193.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/193/head:pull/193

PR: https://git.openjdk.java.net/jdk17u-dev/pull/193