[jfx17u] RFR: 8309470: Potential performance improvements in VirtualFlow

[Jose Pereda]

Clean backport of 8309470: Potential performance improvements in VirtualFlow
Reviewed-by: kpk, angorya

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Commit messages:
 - 8309470: Potential performance improvements in VirtualFlow

Changes: https://git.openjdk.org/jfx17u/pull/159/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=159&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309470
  Stats: 217 lines in 2 files changed: 191 ins; 14 del; 12 mod
  Patch: https://git.openjdk.org/jfx17u/pull/159.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u.git pull/159/head:pull/159

PR: https://git.openjdk.org/jfx17u/pull/159