Driver: Add and use darwin::Assemble tool.
 - Based on patch from Pieter de Bie; thanks!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67379 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index 3941726..3165a8f 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -44,7 +44,7 @@
     case Action::CompileJobClass:
       T = new tools::gcc::Compile(*this); break;
     case Action::AssembleJobClass:
-      T = new tools::gcc::Assemble(*this); break;
+      T = new tools::darwin::Assemble(*this); break;
     case Action::LinkJobClass:
       T = new tools::gcc::Link(*this); break;
     case Action::LipoJobClass: