Re-submit "[lldb] Filter DIEs based on qualified name where possible"

This reverts commit 967df65a36.

This fixes test/Shell/SymbolFile/NativePDB/find-functions.cpp. When
looking up functions with the PDB plugins, if we are looking for a
full function name, we should use `GetName` to populate the `name`
field instead of `GetLookupName` since `GetName` has the more
complete information.

lldb/source/Core/ModuleList.cpp

@@ -425,9 +425,8 @@ void ModuleList::FindFunctions(ConstString name,
 
     std::lock_guard<std::recursive_mutex> guard(m_modules_mutex);
     for (const ModuleSP &module_sp : m_modules) {
-      module_sp->FindFunctions(lookup_info.GetLookupName(),
-                               CompilerDeclContext(),
-                               lookup_info.GetNameTypeMask(), options, sc_list);
+      module_sp->FindFunctions(lookup_info, CompilerDeclContext(), options,
+                               sc_list);
     }
 
     const size_t new_size = sc_list.GetSize();