[jdk8u-dev] RFR: 8287463: JFR: Disable TestDevNull.java on Windows

[Jiří Vaněk]

8287463: JFR: Disable TestDevNull.java on Windows

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Commit messages:
 - 8287463: JFR: Disable TestDevNull.java on Windows
 - Removed jdk8 incompatible -Xlog:jfr
 - Avoided usage of jdk11+ Path.of(String) by File(String).toPath
 - removed @requires vm.hasJFR
 - Changed test to use  @library /lib /
 - 8282947: JFR: Dump on shutdown live-locks in some conditions

Changes: https://git.openjdk.org/jdk8u-dev/pull/255/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=255&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287463
  Stats: 71 lines in 3 files changed: 67 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/255.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/255/head:pull/255

PR: https://git.openjdk.org/jdk8u-dev/pull/255