Lift VFS from clang to llvm (NFC)

This patch moves the virtual file system form clang to llvm so it can be
used by more projects.

Concretely the patch:
 - Moves VirtualFileSystem.{h|cpp} from clang/Basic to llvm/Support.
 - Moves the corresponding unit test from clang to llvm.
 - Moves the vfs namespace from clang::vfs to llvm::vfs.
 - Formats the lines affected by this change, mostly this is the result of
   the added llvm namespace.

RFC on the mailing list:
http://lists.llvm.org/pipermail/llvm-dev/2018-October/126657.html

Differential revision: https://reviews.llvm.org/D52783

llvm-svn: 344140

1 files changed, 2 insertions, 2 deletions

diff --git a/clang-tools-extra/clangd/CodeComplete.h b/clang-tools-extra/clangd/CodeComplete.h
index d0c8a70673f..4d3241427f9 100644
--- a/clang-tools-extra/clangd/CodeComplete.h
+++ b/clang-tools-extra/clangd/CodeComplete.h
@@ -224,7 +224,7 @@ CodeCompleteResult codeComplete(PathRef FileName,
                                 const tooling::CompileCommand &Command,
                                 const PreambleData *Preamble,
                                 StringRef Contents, Position Pos,
-                                IntrusiveRefCntPtr<vfs::FileSystem> VFS,
+                                IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,
                                 std::shared_ptr<PCHContainerOperations> PCHs,
                                 CodeCompleteOptions Opts,
                                 SpeculativeFuzzyFind *SpecFuzzyFind = nullptr);
@@ -234,7 +234,7 @@ SignatureHelp signatureHelp(PathRef FileName,
                             const tooling::CompileCommand &Command,
                             const PreambleData *Preamble, StringRef Contents,
                             Position Pos,
-                            IntrusiveRefCntPtr<vfs::FileSystem> VFS,
+                            IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,
                             std::shared_ptr<PCHContainerOperations> PCHs,
                             const SymbolIndex *Index);