RFR: 8270873: JFR: Catch DirectoryIteratorException when scanning for .jfr files

[Erik Gahlin]

Hi,

Could I have a review of a bug fix that adds guards against DirectoryIteratorException while scanning the repository for chunk files. 

Testing: test/jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.java.net/jdk/pull/5507/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5507&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270873
  Stats: 8 lines in 1 file changed: 1 ins; 1 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5507.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5507/head:pull/5507

PR: https://git.openjdk.java.net/jdk/pull/5507