Resubmit FileSystem changes.

This was originall reverted due to some test failures in
ModuleCache and TestCompDirSymlink.  These issues have all
been resolved and the code now passes all tests.

Differential Revision: https://reviews.llvm.org/D30698

llvm-svn: 297300
diff --git a/lldb/source/Core/Debugger.cpp b/lldb/source/Core/Debugger.cpp
index 7d4f94a..8af2bad 100644
--- a/lldb/source/Core/Debugger.cpp
+++ b/lldb/source/Core/Debugger.cpp
@@ -557,7 +557,7 @@
 }
 
 static FileSpec::EnumerateDirectoryResult
-LoadPluginCallback(void *baton, FileSpec::FileType file_type,
+LoadPluginCallback(void *baton, llvm::sys::fs::file_type ft,
                    const FileSpec &file_spec) {
   Error error;
 
@@ -569,13 +569,13 @@
 
   Debugger *debugger = (Debugger *)baton;
 
+  namespace fs = llvm::sys::fs;
   // If we have a regular file, a symbolic link or unknown file type, try
   // and process the file. We must handle unknown as sometimes the directory
   // enumeration might be enumerating a file system that doesn't have correct
   // file type information.
-  if (file_type == FileSpec::eFileTypeRegular ||
-      file_type == FileSpec::eFileTypeSymbolicLink ||
-      file_type == FileSpec::eFileTypeUnknown) {
+  if (ft == fs::file_type::regular_file || ft == fs::file_type::symlink_file ||
+      ft == fs::file_type::type_unknown) {
     FileSpec plugin_file_spec(file_spec);
     plugin_file_spec.ResolvePath();
 
@@ -588,9 +588,9 @@
     debugger->LoadPlugin(plugin_file_spec, plugin_load_error);
 
     return FileSpec::eEnumerateDirectoryResultNext;
-  } else if (file_type == FileSpec::eFileTypeUnknown ||
-             file_type == FileSpec::eFileTypeDirectory ||
-             file_type == FileSpec::eFileTypeSymbolicLink) {
+  } else if (ft == fs::file_type::directory_file ||
+             ft == fs::file_type::symlink_file ||
+             ft == fs::file_type::type_unknown) {
     // Try and recurse into anything that a directory or symbolic link.
     // We must also do this for unknown as sometimes the directory enumeration
     // might be enumerating a file system that doesn't have correct file type