Refactor the use of Method by the oat compiler.

Change-Id: Ib0ee18ed06846f82567f746edc7a5049dc6215df
diff --git a/src/class_linker.cc b/src/class_linker.cc
index 584c53e..3341d88 100644
--- a/src/class_linker.cc
+++ b/src/class_linker.cc
@@ -1335,7 +1335,7 @@
     dst->SetNumOuts(code_item->outs_size_);
   } else {
     uint16_t num_args = Method::NumArgRegisters(shorty);
-    if ((it.GetMemberAccessFlags() & kAccStatic) != 0) {
+    if ((it.GetMemberAccessFlags() & kAccStatic) == 0) {
       ++num_args;
     }
     dst->SetNumRegisters(num_args);