Allow multiple HX86ComputeBaseMethodAddress.

So that even graphs with irreducible loops can use it
and avoid loading methods/classes/strings through KDexCacheViaMethod.

Test: test-art-host
Change-Id: I14109cfdc82347a7af420ca0ee55172ec37ca8ef
diff --git a/compiler/optimizing/nodes_x86.h b/compiler/optimizing/nodes_x86.h
index fa47976..75893c3 100644
--- a/compiler/optimizing/nodes_x86.h
+++ b/compiler/optimizing/nodes_x86.h
@@ -71,6 +71,10 @@
     SetRawInputAt(1, method_base);
   }
 
+  HX86ComputeBaseMethodAddress* GetBaseMethodAddress() const {
+    return InputAt(1)->AsX86ComputeBaseMethodAddress();
+  }
+
   DECLARE_INSTRUCTION(X86FPNeg);
 
  private: