remove old compatibility APIs, use StringRef versions instead.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@119935 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index 2eb2096..55331f6 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -2584,8 +2584,7 @@
   ASTUnit *CXXUnit = static_cast<ASTUnit *>(tu->TUData);
 
   FileManager &FMgr = CXXUnit->getFileManager();
-  const FileEntry *File = FMgr.getFile(file_name, file_name+strlen(file_name),
-                                       CXXUnit->getFileSystemOpts());
+  const FileEntry *File = FMgr.getFile(file_name, CXXUnit->getFileSystemOpts());
   return const_cast<FileEntry *>(File);
 }