Added macros OBJECT_IMPLEMENTATION and FINAL_OBJECT_IMPLEMENTATION

lib/integers.cc

Index: lib/integers.cc
===================================================================
--- lib/integers.cc	(revision 17436)
+++ lib/integers.cc	(working copy)
@@ -23,13 +23,13 @@
 static bool CheckInteger(const Integer& i) {
   if (i.IsBigint()) {
     Bigint& bigint = Bigint::Handle();
-    bigint |= i.raw();
+    bigint ^= i.raw();
     return !BigintOperations::FitsIntoSmi(bigint) &&
         !BigintOperations::FitsIntoMint(bigint);
   }
   if (i.IsMint()) {
     Mint& mint = Mint::Handle();
-    mint |= i.raw();
+    mint ^= i.raw();
     return !Smi::IsValid64(mint.value());
   }
   return true;
@@ -218,7 +218,7 @@
   }
   if (value.IsSmi()) {
     Smi& smi_value = Smi::Handle();
-    smi_value |= value.raw();
+    smi_value ^= value.raw();
     return smi_value.ShiftOp(kind, amount);
   }
   Bigint& big_value = Bigint::Handle();
@@ -240,7 +240,7 @@
     }
   } else {
     ASSERT(value.IsBigint());
-    big_value |= value.raw();
+    big_value ^= value.raw();
   }
   switch (kind) {
     case Token::kSHL: