RFR: 8257569: Failure observed with JfrVirtualMemory::initialize

[Markus Grönlund]

Greetings,

please review this small adjustment to improve the treatment of ReservedSpaces marked special with the entire memory pre-committed.

Testing: jdk_jfr

Thanks
Markus

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Commit messages:
 - 8257569: Failure observed with JfrVirtualMemory::initialize

Changes: https://git.openjdk.java.net/jdk/pull/2391/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2391&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257569
  Stats: 7 lines in 1 file changed: 2 ins; 4 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2391.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2391/head:pull/2391

PR: https://git.openjdk.java.net/jdk/pull/2391