[assembler] Remove unnecessary cast.

src/ia32/assembler-ia32-inl.h

Index: src/ia32/assembler-ia32-inl.h
diff --git a/src/ia32/assembler-ia32-inl.h b/src/ia32/assembler-ia32-inl.h
index d8a107b113d1a1ab057e472e8ce6bb739fe5f87c..7647bc18e7dcff88dddb4fecb9ae2b590f6655f0 100644
--- a/src/ia32/assembler-ia32-inl.h
+++ b/src/ia32/assembler-ia32-inl.h
@@ -226,9 +226,9 @@ void RelocInfo::set_debug_call_address(Address target) {
   Address location = pc_ + Assembler::kPatchDebugBreakSlotAddressOffset;
   Assembler::set_target_address_at(isolate_, location, host_, target);
   if (host() != NULL) {
-    Object* target_code = Code::GetCodeFromTargetAddress(target);
-    host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
-        host(), this, HeapObject::cast(target_code));
+    Code* target_code = Code::GetCodeFromTargetAddress(target);
+    host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(host(), this,
+                                                                  target_code);
   }
 }