[Object][COFF] Revert r258665 - It doesn't do what I had intended.

I'm discussing the right approach for tracking visibility for COFF symbols on
the llvm-dev list.

llvm-svn: 258666

Author: lhames

llvm/lib/Object/COFFObjectFile.cpp

@@ -207,7 +207,7 @@ uint32_t COFFObjectFile::getSymbolFlags(DataRefImpl Ref) const {
   uint32_t Result = SymbolRef::SF_None;
 
   if (Symb.isExternal() || Symb.isWeakExternal())
-    Result |= (SymbolRef::SF_Global | SymbolRef::SF_Exported);
+    Result |= SymbolRef::SF_Global;
 
   if (Symb.isWeakExternal())
     Result |= SymbolRef::SF_Weak;