RFR: CODETOOLS-7903066: jcstress: Do not print fake CPU mappings from FallbackTopology

[Aleksey Shipilev]

Those layouts are fake, they are not used anywhere, and can be skipped from printing.

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Commit messages:
 - Fix

Changes: https://git.openjdk.java.net/jcstress/pull/108/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=108&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903066
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/108.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/108/head:pull/108

PR: https://git.openjdk.java.net/jcstress/pull/108