Revert "Decouple dllexport/dllimport from linkage"

Revert this for now until I fix an issue in Clang with it.

This reverts commit r199204.

llvm-svn: 199207
diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp
index 7b2d1d7..fd10a4a 100644
--- a/llvm/lib/Target/X86/X86FastISel.cpp
+++ b/llvm/lib/Target/X86/X86FastISel.cpp
@@ -697,7 +697,7 @@
       return false;
 
     // Can't handle DLLImport.
-    if (GV->hasDLLImportStorageClass())
+    if (GV->hasDLLImportLinkage())
       return false;
 
     // Can't handle TLS.