RFR: 8306636: Disable compiler/c2/Test6905845.java with -XX:TieredStopAtLevel=3

[Ramkumar Sunderbabu]

Disable the c2 test for TieredStopAtLevel=3

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Commit messages:
 - 8306636: Disable compiler/c2/Test6905845.java with -XX:TieredStopAtLevel=3

Changes: https://git.openjdk.org/jdk/pull/13579/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13579&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306636
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13579.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13579/head:pull/13579

PR: https://git.openjdk.org/jdk/pull/13579