[jdk16] RFR: 8260473: [vector] ZGC: VectorReshape test produces incorrect results …

[王超]

…with ZGC enabled

https://bugs.openjdk.java.net/browse/JDK-8260473

Function "PhaseVector::expand_vunbox_node" creates a LoadNode, but forgets to make the LoadNode to pass gc barriers.

Testing: all Vector API related tests have passed.

Original pr: https://github.com/openjdk/jdk/pull/2253

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Commit messages:
 - 8260473: [vector] ZGC: VectorReshape test produces incorrect results with ZGC enabled

Changes: https://git.openjdk.java.net/jdk16/pull/139/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16&pr=139&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260473
  Stats: 174 lines in 2 files changed: 165 ins; 0 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk16/pull/139.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16 pull/139/head:pull/139

PR: https://git.openjdk.java.net/jdk16/pull/139