ART: Create a RemoveBlock method

The RemoveDeadBlocks should be separated into a utility function to remove
  a single block so that it can be used as a future utility method.

Change-Id: I4c67113fff24e92a66a81bc0e8edf9fbdda08cdf
Signed-off-by: Jean Christophe Beyler <jean.christophe.beyler@intel.com>
diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index c963b70..601d45e 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -195,6 +195,7 @@
                               ArenaBitVector* visiting);
   void RemoveInstructionsAsUsersFromDeadBlocks(const ArenaBitVector& visited) const;
   void RemoveDeadBlocks(const ArenaBitVector& visited) const;
+  void RemoveBlock(HBasicBlock* block) const;
 
   ArenaAllocator* const arena_;