--- old/src/hotspot/cpu/x86/c1_CodeStubs_x86.cpp	2019-02-07 03:24:09.204276713 -0800
+++ new/src/hotspot/cpu/x86/c1_CodeStubs_x86.cpp	2019-02-07 03:24:09.004269475 -0800
@@ -180,6 +180,29 @@
 }
 
 
+// Implementation of StoreFlattenedArrayStub
+
+StoreFlattenedArrayStub::StoreFlattenedArrayStub(LIR_Opr array, LIR_Opr index, LIR_Opr value, CodeEmitInfo* info) {
+  _array = array;
+  _index = index;
+  _value = value;
+  _info = new CodeEmitInfo(info);
+}
+
+
+void StoreFlattenedArrayStub::emit_code(LIR_Assembler* ce) {
+  assert(__ rsp_offset() == 0, "frame size should be fixed");
+  __ bind(_entry);
+  ce->store_parameter(_array->as_register(), 2);
+  ce->store_parameter(_index->as_register(), 1);
+  ce->store_parameter(_value->as_register(), 0);
+  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::store_flattened_array_id)));
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  __ jmp(_continuation);
+}
+
+
 // Implementation of NewInstanceStub
 
 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {