Extend out the block descriptor structure for debug information with
the copy/dispose helpers as appropriate.

llvm-svn: 84817
diff --git a/clang/lib/Frontend/PCHReader.cpp b/clang/lib/Frontend/PCHReader.cpp
index 82e5033..c02959f 100644
--- a/clang/lib/Frontend/PCHReader.cpp
+++ b/clang/lib/Frontend/PCHReader.cpp
@@ -1591,6 +1591,9 @@
     Context->ObjCClassRedefinitionType = GetType(ObjCClassRedef);
   if (unsigned String = SpecialTypes[pch::SPECIAL_TYPE_BLOCK_DESCRIPTOR])
     Context->setBlockDescriptorType(GetType(String));
+  if (unsigned String
+      = SpecialTypes[pch::SPECIAL_TYPE_BLOCK_EXTENDED_DESCRIPTOR])
+    Context->setBlockDescriptorExtendedType(GetType(String));
 }
 
 /// \brief Retrieve the name of the original source file name