0.51: Only allow one active comp thread pre-checkpoint under -XX:+DebugOnRestore#21468

mpirvu merged 1 commit intoeclipse-openj9:v0.51.0-releaseeclipse-openj9/openj9:v0.51.0-releasefrom

dsouzai:oneCompThreadPreCheckpoint_0.51dsouzai/openj9:oneCompThreadPreCheckpoint_0.51Copy head branch name to clipboard