src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/HotSpotGraalRuntime.java
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/HotSpotGraalRuntime.java Fri Nov 22 15:32:00 2019 -0800
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/HotSpotGraalRuntime.java Fri Nov 22 19:23:30 2019 -0800
@@ -232,6 +232,7 @@
// Supported GCs
Serial(true, "UseSerialGC"),
Parallel(true, "UseParallelGC", "UseParallelOldGC"),
+ CMS(true, "UseConcMarkSweepGC"),
G1(true, "UseG1GC"),
// Unsupported GCs