Add Smi::Zero and replace all Smi::FromInt(0) calls

src/full-codegen/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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/full-codegen/full-codegen.h"
 #include "src/ast/compile-time-value.h"
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
@@ skipping 339 matching lines @@
     __ LoadRoot(x0, Heap::kUndefinedValueRootIndex);
   }
   EmitReturnSequence();
 
   // Force emission of the pools, so they don't get emitted in the middle
   // of the back edge table.
   masm()->CheckVeneerPool(true, false);
   masm()->CheckConstPool(true, false);
 }
 
-
-void FullCodeGenerator::ClearAccumulator() {
-  __ Mov(x0, Smi::FromInt(0));
-}
-
+void FullCodeGenerator::ClearAccumulator() { __ Mov(x0, Smi::kZero); }
 
 void FullCodeGenerator::EmitProfilingCounterDecrement(int delta) {
   __ Mov(x2, Operand(profiling_counter_));
   __ Ldr(x3, FieldMemOperand(x2, Cell::kValueOffset));
   __ Subs(x3, x3, Smi::FromInt(delta));
   __ Str(x3, FieldMemOperand(x2, Cell::kValueOffset));
 }
 
 
 void FullCodeGenerator::EmitProfilingCounterReset() {
@@ skipping 3363 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64