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

src/mips64/macro-assembler-mips64.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.
 
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
@@ skipping 6879 matching lines @@
 
   andi(at, at, kStringRepresentationMask | kStringEncodingMask);
   li(scratch, Operand(encoding_mask));
   Check(eq, kUnexpectedStringType, at, Operand(scratch));
 
   // TODO(plind): requires Smi size check code for mips32.
 
   ld(at, FieldMemOperand(string, String::kLengthOffset));
   Check(lt, kIndexIsTooLarge, index, Operand(at));
 
-  DCHECK(Smi::FromInt(0) == 0);
+  DCHECK(Smi::kZero == 0);
   Check(ge, kIndexIsNegative, index, Operand(zero_reg));
 }
 
 
 void MacroAssembler::PrepareCallCFunction(int num_reg_arguments,
                                           int num_double_arguments,
                                           Register scratch) {
   int frame_alignment = ActivationFrameAlignment();
 
   // n64: Up to eight simple arguments in a0..a3, a4..a7, No argument slots.
@@ skipping 244 matching lines @@
       call_runtime, eq, a3, Operand(Smi::FromInt(kInvalidEnumCacheSentinel)));
 
   LoadRoot(null_value, Heap::kNullValueRootIndex);
   jmp(&start);
 
   bind(&next);
   ld(a1, FieldMemOperand(a2, HeapObject::kMapOffset));
 
   // For all objects but the receiver, check that the cache is empty.
   EnumLength(a3, a1);
-  Branch(call_runtime, ne, a3, Operand(Smi::FromInt(0)));
+  Branch(call_runtime, ne, a3, Operand(Smi::kZero));
 
   bind(&start);
 
   // Check that there are no elements. Register a2 contains the current JS
   // object we've reached through the prototype chain.
   Label no_elements;
   ld(a2, FieldMemOperand(a2, JSObject::kElementsOffset));
   Branch(&no_elements, eq, a2, Operand(empty_fixed_array_value));
 
   // Second chance, the object may be using the empty slow element dictionary.
@@ skipping 237 matching lines @@
   if (mag.shift > 0) sra(result, result, mag.shift);
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS64