[AST] Use ArrayRef in more interfaces

ArrayRef is a little better than passing around a pointer/length pair.

No functional change is intended.

llvm-svn: 274601
diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 948ad5f..22334ab 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -12676,10 +12676,9 @@
   // friend a member of an arbitrary specialization of your template).
 
   Decl *D;
-  if (unsigned NumTempParamLists = TempParams.size())
+  if (!TempParams.empty())
     D = FriendTemplateDecl::Create(Context, CurContext, Loc,
-                                   NumTempParamLists,
-                                   TempParams.data(),
+                                   TempParams,
                                    TSI,
                                    DS.getFriendSpecLoc());
   else