--- old/src/hotspot/cpu/x86/macroAssembler_x86.cpp	2018-05-07 15:51:58.104279717 +0200
+++ new/src/hotspot/cpu/x86/macroAssembler_x86.cpp	2018-05-07 15:51:57.836275178 +0200
@@ -3728,6 +3728,20 @@
   }
 }
 
+void MacroAssembler::test_oop_is_not_value(Register oop, Register temp, Label& is_not_value) {
+  const int mask = Universe::oop_metadata_valuetype_mask();
+#ifdef _LP64
+  if (UseCompressedClassPointers) {
+    movl(temp, Address(oop, oopDesc::klass_offset_in_bytes()));
+  } else
+#endif
+  movptr(temp, Address(oop, oopDesc::klass_offset_in_bytes()));
+
+  andl(temp, mask);
+  testl(temp, temp);
+  jcc(Assembler::zero, is_not_value);
+}
+
 void MacroAssembler::os_breakpoint() {
   // instead of directly emitting a breakpoint, call os:breakpoint for better debugability
   // (e.g., MSVC can't call ps() otherwise)