Use more ArrayRefs

No functional change is intended, just a small refactoring.

llvm-svn: 273647
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index 2dc4c12..e914d79 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -949,7 +949,7 @@
     CGM.getCXXABI().buildThisParam(*this, Args);
   }
 
-  for (auto *Param : FD->params()) {
+  for (auto *Param : FD->parameters()) {
     Args.push_back(Param);
     if (!Param->hasAttr<PassObjectSizeAttr>())
       continue;