Turn FrontendInputFile into an immutable class and have it also accept
a memory buffer instead of only a filename.

llvm-svn: 167627
diff --git a/clang/lib/Frontend/ChainedIncludesSource.cpp b/clang/lib/Frontend/ChainedIncludesSource.cpp
index d2b02de..2d58640 100644
--- a/clang/lib/Frontend/ChainedIncludesSource.cpp
+++ b/clang/lib/Frontend/ChainedIncludesSource.cpp
@@ -67,7 +67,7 @@
   assert(!includes.empty() && "No '-chain-include' in options!");
 
   OwningPtr<ChainedIncludesSource> source(new ChainedIncludesSource());
-  InputKind IK = CI.getFrontendOpts().Inputs[0].Kind;
+  InputKind IK = CI.getFrontendOpts().Inputs[0].getKind();
 
   SmallVector<llvm::MemoryBuffer *, 4> serialBufs;
   SmallVector<std::string, 4> serialBufNames;