Avoid generating jmp +0.

When a block branches to a non-following block, but blocks
in-between do branch to it, we can avoid doing the branch.

Change-Id: I9b343f662a4efc718cd4b58168f93162a24e1219
diff --git a/compiler/optimizing/code_generator_arm.h b/compiler/optimizing/code_generator_arm.h
index 47d81ff..f1a3729 100644
--- a/compiler/optimizing/code_generator_arm.h
+++ b/compiler/optimizing/code_generator_arm.h
@@ -252,7 +252,7 @@
   void MarkGCCard(Register temp, Register card, Register object, Register value);
 
   Label* GetLabelOf(HBasicBlock* block) const {
-    return block_labels_.GetRawStorage() + block->GetBlockId();
+    return CommonGetLabelOf<Label>(block_labels_.GetRawStorage(), block);
   }
 
   void Initialize() OVERRIDE {