Fix memory leak introduced by r201010.

llvm-svn: 201220
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index dd08282..7f6ae56 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -2443,6 +2443,7 @@
   for (unsigned I = 0, N = RemappedFiles.size(); I != N; ++I) {
     PreprocessorOpts.addRemappedFile(RemappedFiles[I].first,
                                      RemappedFiles[I].second);
+    OwnedBuffers.push_back(RemappedFiles[I].second);
   }
 
   // Use the code completion consumer we were given, but adding any cached