Prefer SmallVector::append/insert over push_back loops. Clang edition.

Same functionality, but hoists the vector growth out of the loop.

llvm-svn: 229508
diff --git a/clang/lib/CodeGen/CGObjC.cpp b/clang/lib/CodeGen/CGObjC.cpp
index 34c6d94..19f5ca2 100644
--- a/clang/lib/CodeGen/CGObjC.cpp
+++ b/clang/lib/CodeGen/CGObjC.cpp
@@ -472,8 +472,7 @@
   args.push_back(OMD->getSelfDecl());
   args.push_back(OMD->getCmdDecl());
 
-  for (const auto *PI : OMD->params())
-    args.push_back(PI);
+  args.append(OMD->param_begin(), OMD->param_end());
 
   CurGD = OMD;
   CurEHLocation = OMD->getLocEnd();