[PredicateInfo] Remove unused member (NFC)

PredicateInfo takes up a large amount of memory during IPSCCP
with many functions. And a large part of that space seems to
be going completely to waste here...

llvm/include/llvm/Transforms/Utils/PredicateInfo.h

@@ -197,11 +197,8 @@ class PredicateInfo {
 private:
   // Used to store information about each value we might rename.
   struct ValueInfo {
-    // Information about each possible copy. During processing, this is each
-    // inserted info. After processing, we move the uninserted ones to the
-    // uninserted vector.
+    // Information about each possible copy.
     SmallVector<PredicateBase *, 4> Infos;
-    SmallVector<PredicateBase *, 4> UninsertedInfos;
   };
   // This owns the all the predicate infos in the function, placed or not.
   iplist<PredicateBase> AllInfos;