Revert "[EquivalenceClasses] Replace findValue with contains (NFC)."

Breaks clang builds.

This reverts commit 8e390de.

Author: fhahn

llvm/include/llvm/ADT/EquivalenceClasses.h

@@ -179,9 +179,10 @@ class EquivalenceClasses {
     return member_iterator(nullptr);
   }
 
-  /// Returns true if \p V is contained an equivalence class.
-  bool contains(const ElemTy &V) const {
-    return TheMapping.find(V) != TheMapping.end();
+  /// findValue - Return an iterator to the specified value.  If it does not
+  /// exist, end() is returned.
+  iterator findValue(const ElemTy &V) const {
+    return TheMapping.find(V);
   }
 
   /// getLeaderValue - Return the leader for the specified value that is in the

llvm/lib/Analysis/LoopAccessAnalysis.cpp

@@ -1230,7 +1230,7 @@ bool AccessAnalysis::canCheckPtrAtRT(
                      [this](const Value *Ptr) {
                        MemAccessInfo AccessWrite(const_cast<Value *>(Ptr),
                                                  true);
-                       return !DepCands.contains(AccessWrite);
+                       return DepCands.findValue(AccessWrite) == DepCands.end();
                      })) &&
              "Can only skip updating CanDoRT below, if all entries in AS "
              "are reads or there is at most 1 entry");