C++11 rangify for loop.

llvm-svn: 239064
diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index 7f0c7ba..87c8caa 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -453,10 +453,8 @@
   std::string FeaturesStr;
   if (!TargetOpts.Features.empty()) {
     SubtargetFeatures Features;
-    for (std::vector<std::string>::const_iterator
-           it = TargetOpts.Features.begin(),
-           ie = TargetOpts.Features.end(); it != ie; ++it)
-      Features.AddFeature(*it);
+    for (const std::string &Feature : TargetOpts.Features)
+      Features.AddFeature(Feature);
     FeaturesStr = Features.getString();
   }