Revert "[NFC] Explicitly pass a VFS when creating DiagnosticsEngine (#115852)"

Reverted for causing:
https://github.com/llvm/llvm-project/issues/117145

This reverts commit bdd10d9d249bd1c2a45e3de56a5accd97e953458.

1 files changed, 1 insertions, 4 deletions

diff --git a/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp b/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
index d0b855f..638757a 100644
--- a/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
+++ b/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
@@ -22,7 +22,6 @@
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Option/ArgList.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Host.h"
 using namespace clang;
 using namespace llvm::opt;
@@ -33,9 +32,7 @@ clang::createInvocation(ArrayRef<const char *> ArgList,
   assert(!ArgList.empty());
   auto Diags = Opts.Diags
                    ? std::move(Opts.Diags)
-                   : CompilerInstance::createDiagnostics(
-                         Opts.VFS ? *Opts.VFS : *llvm::vfs::getRealFileSystem(),
-                         new DiagnosticOptions);
+                   : CompilerInstance::createDiagnostics(new DiagnosticOptions);
 
   SmallVector<const char *, 16> Args(ArgList);