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

src/builtins/arm64/builtins-arm64.cc

 // Copyright 2013 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_ARM64
 
 #include "src/arm64/frames-arm64.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
@@ skipping 2693 matching lines @@
   Register new_target = x3;
 
   Register scratch = x2;
   Register scratch2 = x6;
 
   Register spread = x4;
   Register spread_map = x5;
 
   Register spread_len = x5;
 
+  Label runtime_call, push_args;
   __ Peek(spread, 0);
+  __ JumpIfSmi(spread, &runtime_call);
   __ Ldr(spread_map, FieldMemOperand(spread, HeapObject::kMapOffset));
 
-  Label runtime_call, push_args;
   // Check that the spread is an array.
   __ CompareInstanceType(spread_map, scratch, JS_ARRAY_TYPE);
   __ B(ne, &runtime_call);
 
   // Check that we have the original ArrayPrototype.
   __ Ldr(scratch, FieldMemOperand(spread_map, Map::kPrototypeOffset));
   __ Ldr(scratch2, NativeContextMemOperand());
   __ Ldr(scratch2,
          ContextMemOperand(scratch2, Context::INITIAL_ARRAY_PROTOTYPE_INDEX));
   __ Cmp(scratch, scratch2);
@@ skipping 432 matching lines @@
     __ Unreachable();
   }
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM