ARM64: Add and use SmiTagAndPush.

src/arm64/full-codegen-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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 1157 matching lines @@
 
   __ EnumLengthUntagged(x1, x0);
   __ Cbz(x1, &no_descriptors);
 
   __ LoadInstanceDescriptors(x0, x2);
   __ Ldr(x2, FieldMemOperand(x2, DescriptorArray::kEnumCacheOffset));
   __ Ldr(x2,
          FieldMemOperand(x2, DescriptorArray::kEnumCacheBridgeCacheOffset));
 
   // Set up the four remaining stack slots.
-  __ Push(x0);  // Map.
-  __ Mov(x0, Smi::FromInt(0));
-  // Push enumeration cache, enumeration cache length (as smi) and zero.
-  __ SmiTag(x1);
-  __ Push(x2, x1, x0);
+  __ Push(x0, x2);              // Map, enumeration cache.
+  __ SmiTagAndPush(x1, xzr);    // Enum cache length, zero (both as smis).
   __ B(&loop);
 
   __ Bind(&no_descriptors);
   __ Drop(1);
   __ B(&exit);
 
   // We got a fixed array in register x0. Iterate through that.
   __ Bind(&fixed_array);
 
   __ LoadObject(x1, FeedbackVector());
@@ skipping 3703 matching lines @@
   return previous_;
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64