[FileSystem] Move path resolution logic out of FileSpec

This patch removes the logic for resolving paths out of FileSpec and
updates call sites to rely on the FileSystem class instead.

Differential revision: https://reviews.llvm.org/D53915

llvm-svn: 345890
diff --git a/lldb/source/Core/Debugger.cpp b/lldb/source/Core/Debugger.cpp
index 5b88246..16924d5 100644
--- a/lldb/source/Core/Debugger.cpp
+++ b/lldb/source/Core/Debugger.cpp
@@ -625,8 +625,8 @@
   // file type information.
   if (ft == fs::file_type::regular_file || ft == fs::file_type::symlink_file ||
       ft == fs::file_type::type_unknown) {
-    FileSpec plugin_file_spec(path, false);
-    plugin_file_spec.ResolvePath();
+    FileSpec plugin_file_spec(path);
+    FileSystem::Instance().Resolve(plugin_file_spec);
 
     if (plugin_file_spec.GetFileNameExtension() != g_dylibext &&
         plugin_file_spec.GetFileNameExtension() != g_solibext) {