[ADT] Remove an extraneous ternary operator (NFC)

Author: kazutakahirata

llvm/include/llvm/ADT/SparseSet.h

@@ -233,7 +233,7 @@ class SparseSet {
   /// Check if the set contains the given \c Key.
   ///
   /// @param Key A valid key to find.
-  bool contains(const KeyT &Key) const { return find(Key) == end() ? 0 : 1; }
+  bool contains(const KeyT &Key) const { return find(Key) != end(); }
 
   /// count - Returns 1 if this set contains an element identified by Key,
   /// 0 otherwise.