RFR: 8297964: Jetty.java fails "assert(_no_handle_mark_nesting == 0) failed: allocating handle inside NoHandleMark"

[Markus Grönlund]

Greetings,

this small change resolves the assertions on no_handle_mark_nesting, a problem resulting from continuations requiring handles for stack walking. Issue only in debug builds.

Testing: jdk_jfr

Thanks
Markus

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Commit messages:
 - 8297964

Changes: https://git.openjdk.org/jdk/pull/11534/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11534&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297964
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11534.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11534/head:pull/11534

PR: https://git.openjdk.org/jdk/pull/11534