Use the range variant of find instead of unpacking begin/end

If the result of the find is only used to compare against end(), just
use is_contained instead.

No functionality change is intended.

llvm-svn: 278433
diff --git a/llvm/lib/CodeGen/AllocationOrder.cpp b/llvm/lib/CodeGen/AllocationOrder.cpp
index 40451c0..d840a2f 100644
--- a/llvm/lib/CodeGen/AllocationOrder.cpp
+++ b/llvm/lib/CodeGen/AllocationOrder.cpp
@@ -48,7 +48,7 @@
   });
 #ifndef NDEBUG
   for (unsigned I = 0, E = Hints.size(); I != E; ++I)
-    assert(std::find(Order.begin(), Order.end(), Hints[I]) != Order.end() &&
+    assert(is_contained(Order, Hints[I]) &&
            "Target hint is outside allocation order.");
 #endif
 }