eliminate calls to deprecated Use::init() interface

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51570 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Bitcode/Reader/BitcodeReader.h

@@ -89,7 +89,7 @@ private:
       resize(Idx * 2 + 1);
     }
     assert(getOperand(Idx) == 0 && "Cannot init an already init'd Use!");
-    OperandList[Idx].init(V, this);
+    OperandList[Idx] = V;
   }
 };