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

[Jaroslav Bachorik]

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

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

Changes: https://git.openjdk.java.net/jdk/pull/1823/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1823&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258396
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 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