The test

    vmTestbase/vm/compiler/optimizations/stringconcat/explicit/Merge01/cs_enabled/TestDescription.java

timed out once in tier7 on linux-aarch64-debug with

    -Xcomp -ea -esa -XX:CompileThreshold=100 -XX:+UnlockExperimentalVMOptions -server -XX:-TieredCompilation -XX:+DeoptimizeALot