Revert "[VFS] Skip non existent files from the VFS tree"

Breaking bots:
http://lab.llvm.org:8080/green/job/clang-stage1-cmake-RA-incremental_check/27281/

This reverts commit r278457.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@278459 91177308-0d34-0410-b5e6-96231b3b80d8

Author: bcardosolopes

Diff for: lib/Basic/VirtualFileSystem.cpp

@@ -1778,47 +1778,29 @@ VFSFromYamlDirIterImpl::VFSFromYamlDirIterImpl(
     RedirectingDirectoryEntry::iterator Begin,
     RedirectingDirectoryEntry::iterator End, std::error_code &EC)
     : Dir(_Path.str()), FS(FS), Current(Begin), End(End) {
-  while (Current != End) {
+  if (Current != End) {
     SmallString<128> PathStr(Dir);
     llvm::sys::path::append(PathStr, (*Current)->getName());
     llvm::ErrorOr<vfs::Status> S = FS.status(PathStr);
-    if (S) {
+    if (S)
       CurrentEntry = *S;
-      return;
-    }
-    // Skip entries which do not map to a reliable external content.
-    if (FS.ignoreNonExistentContents() &&
-        S.getError() == llvm::errc::no_such_file_or_directory) {
-      ++Current;
-      continue;
-    } else {
+    else
       EC = S.getError();
-      break;
-    }
   }
 }
 
 std::error_code VFSFromYamlDirIterImpl::increment() {
   assert(Current != End && "cannot iterate past end");
-  while (++Current != End) {
+  if (++Current != End) {
     SmallString<128> PathStr(Dir);
     llvm::sys::path::append(PathStr, (*Current)->getName());
     llvm::ErrorOr<vfs::Status> S = FS.status(PathStr);
-    if (!S) {
-      // Skip entries which do not map to a reliable external content.
-      if (FS.ignoreNonExistentContents() &&
-          S.getError() == llvm::errc::no_such_file_or_directory) {
-        continue;
-      } else {
-        return S.getError();
-      }
-    }
+    if (!S)
+      return S.getError();
     CurrentEntry = *S;
-    break;
-  }
-
-  if (Current == End)
+  } else {
     CurrentEntry = Status();
+  }
   return std::error_code();
 }