Use page header information to test for InNewSpace.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 2e5dec442ee00b24e35ebbfd3bb090bcdebcfced..1843850b6ab31822c7a8c9af1d4c7688ace9f346 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -79,14 +79,6 @@ class MacroAssembler: public Assembler {
                            Register scratch,
                            SaveFPRegsMode save_fp);
 
-  // Check if object is in new space.
-  // scratch can be object itself, but it will be clobbered.
-  template <typename LabelType>
-  void InNewSpace(Register object,
-                  Register scratch,
-                  Condition cc,  // equal for new space, not_equal otherwise.
-                  LabelType* branch);
-
   template<typename LabelType>
   void CheckPageFlag(Register object,
                      Register scratch,
@@ -793,37 +785,6 @@ class MacroAssembler: public Assembler {
 };
 
 
-template <typename LabelType>
-void MacroAssembler::InNewSpace(Register object,
-                                Register scratch,
-                                Condition cc,
-                                LabelType* branch) {
-  ASSERT(cc == equal || cc == not_equal);
-  if (Serializer::enabled()) {
-    // Can't do arithmetic on external references if it might get serialized.
-    Move(scratch, object);
-    // The mask isn't really an address.  We load it as an external reference in
-    // case the size of the new space is different between the snapshot maker
-    // and the running system.
-    and_(Operand(scratch),
-         Immediate(ExternalReference::new_space_mask(isolate())));
-    cmp(Operand(scratch),
-        Immediate(ExternalReference::new_space_start(isolate())));
-    j(cc, branch);
-  } else {
-    int32_t new_space_start = reinterpret_cast<int32_t>(
-        ExternalReference::new_space_start(isolate()).address());
-    if (object.is(scratch)) {
-      sub(Operand(scratch), Immediate(new_space_start));
-    } else {
-      lea(scratch, Operand(object, -new_space_start));
-    }
-    and_(scratch, isolate()->heap()->NewSpaceMask());
-    j(cc, branch);
-  }
-}
-
-
 // The code patcher is used to patch (typically) small parts of code e.g. for
 // debugging and other types of instrumentation. When using the code patcher
 // the exact number of bytes specified must be emitted. Is not legal to emit