[jdk17u-dev] RFR: 8297292: java/nio/channels/FileChannel/FileExtensionAndMap.java is too slow

[Goetz Lindenmaier]

I backport this for parity with 17.0.12-oracle.

Skipped ProblemList patch, file was not problemlisted. 
Deleted the file by hand, patch did not apply

As this only deletes a test, I will mark it clean.

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Commit messages:
 - Backport 84e47996e88cf640e5e9d5ab4be8a640c67afbf5

Changes: https://git.openjdk.org/jdk17u-dev/pull/2349/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2349&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297292
  Stats: 203 lines in 1 file changed: 0 ins; 203 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2349.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2349/head:pull/2349

PR: https://git.openjdk.org/jdk17u-dev/pull/2349