Add 'using' declarations to suppress -Woverloaded-virtual warnings.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169214 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/IPO/InlineSimple.cpp

@@ -42,6 +42,7 @@ namespace {
     InlineCost getInlineCost(CallSite CS) {
       return CA.getInlineCost(CS, getInlineThreshold(CS));
     }
+    using llvm::Pass::doInitialization;
     virtual bool doInitialization(CallGraph &CG);
   };
 }