Audit __private_extern__ handling.
 - Exposed quite a few Sema issues and a CodeGen crash.

 - See FIXMEs in test case, and in SemaDecl.cpp (PR3983).

I'm skeptical that __private_extern__ should actually be a storage
class value. I think that __private_extern__ basically amounts to
  extern A __attribute__((visibility("hidden")))
and would be better off handled (a) as that, or (b) with an extra bit
in the VarDecl.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69020 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGBlocks.cpp b/lib/CodeGen/CGBlocks.cpp
index d62379e..f1e7420 100644
--- a/lib/CodeGen/CGBlocks.cpp
+++ b/lib/CodeGen/CGBlocks.cpp
@@ -608,8 +608,7 @@
        ++i) {
     const VarDecl *VD = dyn_cast<VarDecl>(i->first);
     
-    if (VD->getStorageClass() == VarDecl::Static
-        || VD->getStorageClass() == VarDecl::Extern)
+    if (VD->getStorageClass() == VarDecl::Static || VD->hasExternalStorage())
       LocalDeclMap[VD] = i->second;
   }