Add support for invoke-static in optimizing compiler.

Support is limited to calls without parameters and returning
void. For simplicity, we currently follow the Quick ABI.

Change-Id: I54805161141b7eac5959f1cae0dc138dd0b2e8a5
diff --git a/compiler/optimizing/code_generator_x86.h b/compiler/optimizing/code_generator_x86.h
index ad2a061..505237b 100644
--- a/compiler/optimizing/code_generator_x86.h
+++ b/compiler/optimizing/code_generator_x86.h
@@ -57,6 +57,8 @@
 
 #undef DECLARE_VISIT_INSTRUCTION
 
+  void LoadCurrentMethod(Register reg);
+
   Assembler* GetAssembler() const { return assembler_; }
 
  private: