Add GC verification test rules.

Change-Id: I7469ecaf98f680e7e642035f3536b00bdd97b486
diff --git a/test/run-test b/test/run-test
index 2989f25..1df0ec2 100755
--- a/test/run-test
+++ b/test/run-test
@@ -241,7 +241,7 @@
         echo "  Runtime Options:"
         echo "    -O                   Run non-debug rather than debug build (off by default)."
         echo "    -Xcompiler-option    Pass an option to the compiler."
-        echo "    -runtime-option      Pass an option to the runtime."
+        echo "    --runtime-option     Pass an option to the runtime."
         echo "    --debug              Wait for a debugger to attach."
         echo "    --gdb                Run under gdb; incompatible with some tests."
         echo "    --build-only         Build test files only (off by default)."