[jdk17u-dev] RFR: 8208077: File.listRoots performance degradation

[Goetz Lindenmaier]

I backport this for parity with 17.0.7-oracle.

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Commit messages:
 - Backport 5b0af1a80bb4d2a81cda7e26a6ad0db43e679519

Changes: https://git.openjdk.org/jdk17u-dev/pull/1098/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1098&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8208077
  Stats: 29 lines in 2 files changed: 17 ins; 1 del; 11 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1098.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1098/head:pull/1098

PR: https://git.openjdk.org/jdk17u-dev/pull/1098