Small optimization for recursive calls: avoid dex cache.

Change-Id: I044757a2f06e535cdc1480c4fc8182b89635baf6
diff --git a/compiler/optimizing/code_generator_x86.h b/compiler/optimizing/code_generator_x86.h
index 55d71e3..54cb6cd 100644
--- a/compiler/optimizing/code_generator_x86.h
+++ b/compiler/optimizing/code_generator_x86.h
@@ -241,9 +241,12 @@
     return type == Primitive::kPrimLong;
   }
 
+  Label* GetFrameEntryLabel() { return &frame_entry_label_; }
+
  private:
   // Labels for each block that will be compiled.
   GrowableArray<Label> block_labels_;
+  Label frame_entry_label_;
   LocationsBuilderX86 location_builder_;
   InstructionCodeGeneratorX86 instruction_visitor_;
   ParallelMoveResolverX86 move_resolver_;