Correctly store and keep track of the FileSystemOptions in ASTUnit and in clang_codeCompleteAt.

llvm-svn: 127890
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 3eb418c..32c8050 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -881,7 +881,7 @@
   // Configure the various subsystems.
   // FIXME: Should we retain the previous file manager?
   FileSystemOpts = Clang.getFileSystemOpts();
-  FileMgr.reset(new FileManager(Clang.getFileSystemOpts()));
+  FileMgr.reset(new FileManager(FileSystemOpts));
   SourceMgr.reset(new SourceManager(getDiagnostics(), *FileMgr));
   TheSema.reset();
   Ctx.reset();
@@ -1537,7 +1537,8 @@
   ConfigureDiags(Diags, 0, 0, *AST, /*CaptureDiagnostics=*/false);
   AST->Diagnostics = Diags;
   AST->Invocation.reset(CI);
-  AST->FileMgr.reset(new FileManager(CI->getFileSystemOpts()));
+  AST->FileSystemOpts = CI->getFileSystemOpts();
+  AST->FileMgr.reset(new FileManager(AST->FileSystemOpts));
   AST->SourceMgr.reset(new SourceManager(*Diags, *AST->FileMgr));
 
   return AST.take();
@@ -1706,8 +1707,9 @@
   AST.reset(new ASTUnit(false));
   ConfigureDiags(Diags, ArgBegin, ArgEnd, *AST, CaptureDiagnostics);
   AST->Diagnostics = Diags;
-  
-  AST->FileMgr.reset(new FileManager(FileSystemOptions()));
+
+  AST->FileSystemOpts = CI->getFileSystemOpts();
+  AST->FileMgr.reset(new FileManager(AST->FileSystemOpts));
   AST->OnlyLocalDecls = OnlyLocalDecls;
   AST->CaptureDiagnostics = CaptureDiagnostics;
   AST->CompleteTranslationUnit = CompleteTranslationUnit;