I am about to change llvm::MemoryBuffer::getFile take take a Twine. Change
clang first so that the build still works.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193428 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/GlobalModuleIndex.cpp b/lib/Serialization/GlobalModuleIndex.cpp
index 675804e..fb647b0 100644
--- a/lib/Serialization/GlobalModuleIndex.cpp
+++ b/lib/Serialization/GlobalModuleIndex.cpp
@@ -229,7 +229,8 @@
   llvm::sys::path::append(IndexPath, IndexFileName);
 
   llvm::OwningPtr<llvm::MemoryBuffer> Buffer;
-  if (llvm::MemoryBuffer::getFile(IndexPath, Buffer) != llvm::errc::success)
+  if (llvm::MemoryBuffer::getFile(IndexPath.c_str(), Buffer) !=
+      llvm::errc::success)
     return std::make_pair((GlobalModuleIndex *)0, EC_NotFound);
 
   /// \brief The bitstream reader from which we'll read the AST file.