RFR: 8249878: jfr_emergency_dump has secondary crashes

[Markus Grönlund]

Hi,

Please review this small fix to remove an improperly placed assert. The assert is invalid at this location because Java
threads are only a subset of all threads to enter. It was introduced by JDK-8245113 and is a debug support remnant,
used for getting the new states in place.

Thanks,
Markus

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Commit messages:
 - 8249878: jfr_emergency_dump has secondary crashes

Changes: https://git.openjdk.java.net/jdk/pull/682/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=682&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8249878
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/682.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/682/head:pull/682

PR: https://git.openjdk.java.net/jdk/pull/682