--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/GraalOptions.java	2019-05-06 15:58:47.631295954 +0200
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/GraalOptions.java	2019-05-06 15:58:47.231293393 +0200
@@ -279,9 +279,13 @@
     @Option(help = "Enable inlining decision tracing in stubs and snippets.", type = OptionType.Debug)
     public static final OptionKey<Boolean> TraceInliningForStubsAndSnippets = new OptionKey<>(false);
 
-    @Option(help = "Use Graal-generated stubs for complicated LIR operations instead of embedding all the emitted code.")
+    @Option(help = "Use Graal-generated stubs for complicated LIR operations instead of embedding all the emitted code.", type = OptionType.Expert)
     public static final OptionKey<Boolean> UseGraalStubs = new OptionKey<>(true);
 
     @Option(help = "Encode and decode snippets and substitutions before parsing to test libgraal code path. This option is ignored in the context of libgraal.")
     public static final OptionKey<Boolean> UseEncodedGraphs = new OptionKey<>(false);
+
+    @Option(help = "If applicable, use bulk zeroing instructions when the zeroing size in bytes exceeds this threshold.", type = OptionType.Expert)
+    public static final OptionKey<Integer> MinimalBulkZeroingSize = new OptionKey<>(2048);
+
 }