Fixed a bug handling void function types.
Requires rebuild of llvm-gcc4 (touch llvm-debug.cpp.)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29131 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/DwarfWriter.cpp b/lib/CodeGen/DwarfWriter.cpp
index 14bb962..ff62b46 100644
--- a/lib/CodeGen/DwarfWriter.cpp
+++ b/lib/CodeGen/DwarfWriter.cpp
@@ -1413,7 +1413,7 @@
       Ty->AddUInt(DW_AT_prototyped, DW_FORM_flag, 1);
       // Add return type.
       Ty->AddDIEntry(DW_AT_type, DW_FORM_ref4,
-                     NewType(Context, cast<TypeDesc>(Elements[0]), Unit));
+                     NewType(Context, dyn_cast<TypeDesc>(Elements[0]), Unit));
       
       // Add arguments.
       for(unsigned i = 1, N = Elements.size(); i < N; ++i) {