[Transforms] Use is_contained (NFC)

llvm/lib/Transforms/IPO/HotColdSplitting.cpp

@@ -283,7 +283,7 @@ static int getOutliningPenalty(ArrayRef<BasicBlock *> Region,
     }
 
     for (BasicBlock *SuccBB : successors(BB)) {
-      if (find(Region, SuccBB) == Region.end()) {
+      if (!is_contained(Region, SuccBB)) {
         NoBlocksReturn = false;
         SuccsOutsideRegion.insert(SuccBB);
       }

llvm/lib/Transforms/IPO/Inliner.cpp

@@ -906,7 +906,7 @@ PreservedAnalyses InlinerPass::run(LazyCallGraph::SCC &InitialC,
           // Note that after this point, it is an error to do anything other
           // than use the callee's address or delete it.
           Callee.dropAllReferences();
-          assert(find(DeadFunctions, &Callee) == DeadFunctions.end() &&
+          assert(!is_contained(DeadFunctions, &Callee) &&
                  "Cannot put cause a function to become dead twice!");
           DeadFunctions.push_back(&Callee);
           CalleeWasDeleted = true;

llvm/lib/Transforms/Vectorize/VPlanValue.h

@@ -260,7 +260,7 @@ class VPDef {
   void removeDefinedValue(VPValue *V) {
     assert(V->getDef() == this &&
            "can only remove VPValue linked with this VPDef");
-    assert(find(DefinedValues, V) != DefinedValues.end() &&
+    assert(is_contained(DefinedValues, V) &&
            "VPValue to remove must be in DefinedValues");
     erase_value(DefinedValues, V);
     V->Def = nullptr;