RFR: 8361086: JVMCIGlobals::check_jvmci_flags_are_consistent has incorrect format string

[Kim Barrett]

Please review this trivial fix of a format string. The value being printed is
TieredStopAtLevel, which is of type intx, so "%zd" should be used instead of "%d".

Testing: mach5 tier1

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Commit messages:
 - TieredStopAtLevel printing

Changes: https://git.openjdk.org/jdk/pull/26051/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26051&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361086
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26051.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26051/head:pull/26051

PR: https://git.openjdk.org/jdk/pull/26051