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

test/cctest/test-code-stub-assembler.cc

 // Copyright 2015 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/base/utils/random-number-generator.h"
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/compiler/node.h"
 #include "src/ic/stub-cache.h"
 #include "src/isolate.h"
@@ skipping 155 matching lines @@
 
   Handle<Code> code = m.GenerateCode();
   FunctionTester ft(code, kNumParams);
 
   Handle<Object> expect_index(Smi::FromInt(kKeyIsIndex), isolate);
   Handle<Object> expect_unique(Smi::FromInt(kKeyIsUnique), isolate);
   Handle<Object> expect_bailout(Smi::FromInt(kBailout), isolate);
 
   {
     // TryToName(<zero smi>) => if_keyisindex: smi value.
-    Handle<Object> key(Smi::FromInt(0), isolate);
+    Handle<Object> key(Smi::kZero, isolate);
     ft.CheckTrue(key, expect_index, key);
   }
 
   {
     // TryToName(<positive smi>) => if_keyisindex: smi value.
     Handle<Object> key(Smi::FromInt(153), isolate);
     ft.CheckTrue(key, expect_index, key);
   }
 
   {
@@ skipping 750 matching lines @@
     m.Return(m.BooleanConstant(true));
 
     m.Bind(&failed);
     m.Return(m.BooleanConstant(false));
   }
 
   Handle<Code> code = m.GenerateCode();
   FunctionTester ft(code, kNumParams);
 
   Factory* factory = isolate->factory();
-  Handle<Object> smi0(Smi::FromInt(0), isolate);
+  Handle<Object> smi0(Smi::kZero, isolate);
   Handle<Object> smi1(Smi::FromInt(1), isolate);
   Handle<Object> smi7(Smi::FromInt(7), isolate);
   Handle<Object> smi13(Smi::FromInt(13), isolate);
   Handle<Object> smi42(Smi::FromInt(42), isolate);
 
   Handle<Object> expect_found(Smi::FromInt(kFound), isolate);
   Handle<Object> expect_not_found(Smi::FromInt(kNotFound), isolate);
   Handle<Object> expect_bailout(Smi::FromInt(kBailout), isolate);
 
 #define CHECK_FOUND(object, index)                         \
@@ skipping 546 matching lines @@
 
   Handle<Object> constructor =
       Object::GetPropertyOrElement(result,
                                    isolate->factory()->constructor_string())
           .ToHandleChecked();
   CHECK(constructor->SameValue(*isolate->type_error_function()));
 }
 
 }  // namespace internal
 }  // namespace v8