[Builtins] Smi-check the spread and go to runtime in CheckSpreadAndPushToStack.

src/builtins/x64/builtins-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 2746 matching lines @@
   // 3. Call to something that is not callable.
   __ bind(&non_callable);
   {
     FrameScope scope(masm, StackFrame::INTERNAL);
     __ Push(rdi);
     __ CallRuntime(Runtime::kThrowCalledNonCallable);
   }
 }
 
 static void CheckSpreadAndPushToStack(MacroAssembler* masm) {
+  Label runtime_call, push_args;
   // Load the spread argument into rbx.
   __ movp(rbx, Operand(rsp, kPointerSize));
+  __ JumpIfSmi(rbx, &runtime_call);
   // Load the map of the spread into r15.
   __ movp(r15, FieldOperand(rbx, HeapObject::kMapOffset));
   // Load native context into r14.
   __ movp(r14, NativeContextOperand());
 
-  Label runtime_call, push_args;
   // Check that the spread is an array.
   __ CmpInstanceType(r15, JS_ARRAY_TYPE);
   __ j(not_equal, &runtime_call);
 
   // Check that we have the original ArrayPrototype.
   __ movp(rcx, FieldOperand(r15, Map::kPrototypeOffset));
   __ cmpp(rcx, ContextOperand(r14, Context::INITIAL_ARRAY_PROTOTYPE_INDEX));
   __ j(not_equal, &runtime_call);
 
   // Check that the ArrayPrototype hasn't been modified in a way that would
@@ skipping 415 matching lines @@
 void Builtins::Generate_InterpreterOnStackReplacement(MacroAssembler* masm) {
   Generate_OnStackReplacementHelper(masm, true);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64