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, 3 insertions, 3 deletions

diff --git a/clang/tools/libclang/BuildSystem.cpp b/clang/tools/libclang/BuildSystem.cpp
index 79fa69c40ba..6c1f2c145b0 100644
--- a/clang/tools/libclang/BuildSystem.cpp
+++ b/clang/tools/libclang/BuildSystem.cpp
@@ -13,12 +13,12 @@
 
 #include "clang-c/BuildSystem.h"
 #include "CXString.h"
-#include "clang/Basic/VirtualFileSystem.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/Support/CBindingWrapping.h"
 #include "llvm/Support/Chrono.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Path.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace clang;
@@ -28,11 +28,11 @@ unsigned long long clang_getBuildSessionTimestamp(void) {
   return llvm::sys::toTimeT(std::chrono::system_clock::now());
 }
 
-DEFINE_SIMPLE_CONVERSION_FUNCTIONS(clang::vfs::YAMLVFSWriter,
+DEFINE_SIMPLE_CONVERSION_FUNCTIONS(llvm::vfs::YAMLVFSWriter,
                                    CXVirtualFileOverlay)
 
 CXVirtualFileOverlay clang_VirtualFileOverlay_create(unsigned) {
-  return wrap(new clang::vfs::YAMLVFSWriter());
+  return wrap(new llvm::vfs::YAMLVFSWriter());
 }
 
 enum CXErrorCode