[PATCH] CodeGen: Don't form weak dllexport aliases

[Hans Wennborg]

lgtm

================
Comment at: test/CodeGenCXX/dllexport.cpp:608
@@ -609,1 +607,3 @@
 
+// Don't create weak dllexport aliases.
+struct NonExportedBaseClass {
----------------
Maybe put the PR number in the comment as well.

http://reviews.llvm.org/D5986