Add support for static fields in optimizing compiler.

Change-Id: Id2f010589e2bd6faf42c05bb33abf6816ebe9fa9
diff --git a/compiler/optimizing/code_generator.h b/compiler/optimizing/code_generator.h
index 1638869..bf9d2c0 100644
--- a/compiler/optimizing/code_generator.h
+++ b/compiler/optimizing/code_generator.h
@@ -157,6 +157,11 @@
   bool* GetBlockedCoreRegisters() const { return blocked_core_registers_; }
   bool* GetBlockedFloatingPointRegisters() const { return blocked_fpu_registers_; }
 
+  // Helper that returns the pointer offset of an index in an object array.
+  // Note: this method assumes we always have the same pointer size, regardless
+  // of the architecture.
+  static size_t GetCacheOffset(uint32_t index);
+
  protected:
   CodeGenerator(HGraph* graph,
                 size_t number_of_core_registers,