[jdk11u-dev] RFR: 8273807: Zero: Drop incorrect test block from compiler/startup/NumCompilerThreadsCheck.java

[Goetz Lindenmaier]

I backport this for parity with 11.0.20-oracle.

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Commit messages:
 - Backport 1c5de8b86b038f5d5c313c504a8868e36fc80bde

Changes: https://git.openjdk.org/jdk11u-dev/pull/1990/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1990&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8273807
  Stats: 5 lines in 1 file changed: 0 ins; 5 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1990.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1990/head:pull/1990

PR: https://git.openjdk.org/jdk11u-dev/pull/1990