Add support for a verifier to the driver. Currently only verifies debug
output on darwin so is hard coded there.

As a note this will need a little bit of refactoring in the class
hierarchy to separate it out for different verifiers based on input type.

Fixes rdar://8256258.

llvm-svn: 138343
diff --git a/clang/lib/Driver/Action.cpp b/clang/lib/Driver/Action.cpp
index 549ce0a..ac95446 100644
--- a/clang/lib/Driver/Action.cpp
+++ b/clang/lib/Driver/Action.cpp
@@ -31,6 +31,7 @@
   case LinkJobClass: return "linker";
   case LipoJobClass: return "lipo";
   case DsymutilJobClass: return "dsymutil";
+  case VerifyJobClass: return "verify";
   }
 
   assert(0 && "invalid class");
@@ -84,3 +85,7 @@
 DsymutilJobAction::DsymutilJobAction(ActionList &Inputs, types::ID Type)
   : JobAction(DsymutilJobClass, Inputs, Type) {
 }
+
+VerifyJobAction::VerifyJobAction(ActionList &Inputs, types::ID Type)
+  : JobAction(VerifyJobClass, Inputs, Type) {
+}