[Frontend] Rangify for loop. NFC.

llvm-svn: 253178
diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index c0cf64c..04f1390 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -831,13 +831,13 @@
   if (getFrontendOpts().ShowStats)
     llvm::EnableStatistics();
 
-  for (unsigned i = 0, e = getFrontendOpts().Inputs.size(); i != e; ++i) {
+  for (const FrontendInputFile &FIF : getFrontendOpts().Inputs) {
     // Reset the ID tables if we are reusing the SourceManager and parsing
     // regular files.
     if (hasSourceManager() && !Act.isModelParsingAction())
       getSourceManager().clearIDTables();
 
-    if (Act.BeginSourceFile(*this, getFrontendOpts().Inputs[i])) {
+    if (Act.BeginSourceFile(*this, FIF)) {
       Act.Execute();
       Act.EndSourceFile();
     }