Don't print out unique identifier for opaque types

llvm-svn: 6511
diff --git a/llvm/lib/VMCore/AsmWriter.cpp b/llvm/lib/VMCore/AsmWriter.cpp
index 7c58e63..7695fcb 100644
--- a/llvm/lib/VMCore/AsmWriter.cpp
+++ b/llvm/lib/VMCore/AsmWriter.cpp
@@ -504,7 +504,7 @@
     Out << "[" << ATy->getNumElements() << " x ";
     printType(ATy->getElementType()) << "]";
   } else if (const OpaqueType *OTy = dyn_cast<OpaqueType>(Ty)) {
-    Out << OTy->getDescription();
+    Out << "opaque";
   } else {
     if (!Ty->isPrimitiveType())
       Out << "<unknown derived type>";