After JDK-8316991, fastdebug execution prints extraneous logging output due to an unguarded dump statement (https://github.com/openjdk/jdk/pull/15825/files#r1559853541).

For example:

1653 Phi === 1439 1699 1669 1640 1417 [[ 1871 1412 1862 1771 1787 1787 1797 1412 1846 1862 ]] #memory Memory: @BotPTR *+bot, idx=Bot; !orig=[1870] !jvms: TypeReference::createTrusted @ bci:33 (line 106) TypeReference::createTrustedWithoutAssumptions @ bci:2 (line 85) StampTool::typeReferenceOrNull @ bci:38 (line 233) StampTool::typeReferenceOrNull @ bci:7 (line 191) LoadHubNode::findSynonym @ bci:1 (line 104)
1652 Phi === 1439 1698 1668 1639 1416 [[ 1771 1846 ]] #abIO !jvms: TypeReference::createTrusted @ bci:33 (line 106) TypeReference::createTrustedWithoutAssumptions @ bci:2 (line 85) StampTool::typeReferenceOrNull @ bci:38 (line 233) StampTool::typeReferenceOrNull @ bci:7 (line 191) LoadHubNode::findSynonym @ bci:1 (line 104)
1768 IfFalse === 1763 [[ 1771 ]] #0 !jvms: TypeReference::createTrusted @ bci:58 (line 111) TypeReference::createTrustedWithoutAssumptions @ bci:2 (line 85) StampTool::typeReferenceOrNull @ bci:38 (line 233) StampTool::typeReferenceOrNull @ bci:7 (line 191) LoadHubNode::findSynonym @ bci:1 (line 104)