Correctly unwrap 'auto' types. Fixes PR9414.

llvm-svn: 127121
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index bccf6e7..b23b392 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -1374,6 +1374,9 @@
     case Type::SubstTemplateTypeParm:
       T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
       break;
+    case Type::Auto:
+      T = cast<AutoType>(T)->getDeducedType();
+      break;
     }
     
     assert(T != LastT && "Type unwrapping failed to unwrap!");