RFR: 8258396: SIGILL in jdk.jfr.internal.PlatformRecorder.rotateDisk() [v2]

[Jaroslav Bachorik]

> Please, review this simple change which prevents SIGILL on musl libc systems caused by using `memcpy` on possibly overlapping memory regions.

Jaroslav Bachorik has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains one additional commit since the last revision:

  8258396: SIGILL in jdk.jfr.internal.PlatformRecorder.rotateDisk()

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1823/files
  - new: https://git.openjdk.java.net/jdk/pull/1823/files/e3147c7e..dc8d6168

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1823&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1823&range=00-01

  Stats: 3898 lines in 209 files changed: 1884 ins; 877 del; 1137 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1823.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1823/head:pull/1823

PR: https://git.openjdk.java.net/jdk/pull/1823