second pass over removal of Mutex and Condition

llvm-svn: 270024
diff --git a/lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp b/lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp
index 6a10519..ed101dc 100644
--- a/lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp
+++ b/lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp
@@ -1461,7 +1461,7 @@
         if (m_symtab_ap.get() == NULL)
         {
             m_symtab_ap.reset(new Symtab(this));
-            Mutex::Locker symtab_locker (m_symtab_ap->GetMutex());
+            std::lock_guard<std::recursive_mutex> symtab_guard(m_symtab_ap->GetMutex());
             ParseSymtab ();
             m_symtab_ap->Finalize ();
         }