8055111: [TESTBUG] jdk.testlibrary.Utils.removeGcOpts doesn't remove -Xconcgc Reviewed-by: jmasa, brutisso, sla

number array spoiler
-200
-100
-0.5
-0.25
0
0.25
0.5
100
200
-200
-100
-0.5
-0.25
0
0.25
0.5
100
200