[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

lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp

@@ -2749,7 +2749,8 @@ bool ScriptInterpreterPython::LoadScriptingModule(
   lldb::DebuggerSP debugger_sp = m_interpreter.GetDebugger().shared_from_this();
 
   {
-    FileSpec target_file(pathname, true);
+    FileSpec target_file(pathname);
+    FileSystem::Instance().Resolve(target_file);
     std::string basename(target_file.GetFilename().GetCString());
 
     StreamString command_stream;