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

src/x87/macro-assembler-x87.cc

Index: src/x87/macro-assembler-x87.cc
diff --git a/src/x87/macro-assembler-x87.cc b/src/x87/macro-assembler-x87.cc
index dafe985ff8fb3a27f2ee2a0638a2c94362eec7d3..fd4a583bd8356c8f40bfa12532e4c6969d07662d 100644
--- a/src/x87/macro-assembler-x87.cc
+++ b/src/x87/macro-assembler-x87.cc
@@ -2937,7 +2937,7 @@ void MacroAssembler::EmitSeqStringSetCharCheck(Register string,
   cmp(index, FieldOperand(string, String::kLengthOffset));
   Check(less, kIndexIsTooLarge);
 
-  cmp(index, Immediate(Smi::FromInt(0)));
+  cmp(index, Immediate(Smi::kZero));
   Check(greater_equal, kIndexIsNegative);
 
   // Restore the index
@@ -3190,7 +3190,7 @@ void MacroAssembler::CheckEnumCache(Label* call_runtime) {
 
   // For all objects but the receiver, check that the cache is empty.
   EnumLength(edx, ebx);
-  cmp(edx, Immediate(Smi::FromInt(0)));
+  cmp(edx, Immediate(Smi::kZero));
   j(not_equal, call_runtime);
 
   bind(&start);