Add support for static fields in optimizing compiler.

Change-Id: Id2f010589e2bd6faf42c05bb33abf6816ebe9fa9
diff --git a/compiler/utils/arm/assembler_arm32.h b/compiler/utils/arm/assembler_arm32.h
index c89fd04..cfc300b 100644
--- a/compiler/utils/arm/assembler_arm32.h
+++ b/compiler/utils/arm/assembler_arm32.h
@@ -228,6 +228,8 @@
   void CompareAndBranchIfZero(Register r, Label* label) OVERRIDE;
   void CompareAndBranchIfNonZero(Register r, Label* label) OVERRIDE;
 
+  // Memory barriers.
+  void dmb(DmbOptions flavor) OVERRIDE;
 
   // Macros.
   // Add signed constant value to rd. May clobber IP.