Optionally use 31-bits SMI value for 64-bit system

src/ic.cc

Index: src/ic.cc
diff --git a/src/ic.cc b/src/ic.cc
index a55160a394e7f362842e70fb95cd30e65646a7fd..ccac728656c94ece17994545e2f5c1aeebdcff94 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -2615,7 +2615,7 @@ static BinaryOpIC::TypeInfo TypeInfoFromValue(Handle<Object> value,
   v8::internal::TypeInfo type = v8::internal::TypeInfo::FromValue(value);
   if (type.IsSmi()) return BinaryOpIC::SMI;
   if (type.IsInteger32()) {
-    if (kSmiValueSize == 32) return BinaryOpIC::SMI;
+    if (SmiValuesAre32Bits()) return BinaryOpIC::SMI;
     return BinaryOpIC::INT32;
   }
   if (type.IsNumber()) return BinaryOpIC::NUMBER;
@@ -2627,7 +2627,7 @@ static BinaryOpIC::TypeInfo TypeInfoFromValue(Handle<Object> value,
         op == Token::SAR ||
         op == Token::SHL ||
         op == Token::SHR) {
-      if (kSmiValueSize == 32) return BinaryOpIC::SMI;
+      if (SmiValuesAre32Bits()) return BinaryOpIC::SMI;
       return BinaryOpIC::INT32;
     }
     return BinaryOpIC::ODDBALL;
@@ -2705,7 +2705,7 @@ RUNTIME_FUNCTION(MaybeObject*, BinaryOp_Patch) {
       if (op == Token::DIV ||
           op == Token::MUL ||
           op == Token::SHR ||
-          kSmiValueSize == 32) {
+          SmiValuesAre32Bits()) {
         // Arithmetic on two Smi inputs has yielded a heap number.
         // That is the only way to get here from the Smi stub.
         // With 32-bit Smis, all overflows give heap numbers, but with