RFR: 8332955: ubsan: runningCounters.cpp:48:61: runtime error: member call on null pointer of type 'struct VirtualSpaceList'

[Thomas Stuefe]

@MBaesken and @dholmes-ora convinced me this needs fixing. Fix is trivial; for details, please see JBS issue.

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Commit messages:
 - start

Changes: https://git.openjdk.org/jdk/pull/19435/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19435&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332955
  Stats: 7 lines in 1 file changed: 3 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/19435.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19435/head:pull/19435

PR: https://git.openjdk.org/jdk/pull/19435