Adding dllimport, dllexport and external weak linkage types.
DLL* linkages got full (I hope) codegeneration support in C & both x86
assembler backends.
External weak linkage added for future use, we don't provide any
codegeneration, etc. support for it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30374 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86AsmPrinter.h b/lib/Target/X86/X86AsmPrinter.h
index 6db9e45..ae03ca5 100755
--- a/lib/Target/X86/X86AsmPrinter.h
+++ b/lib/Target/X86/X86AsmPrinter.h
@@ -63,6 +63,9 @@
   // Necessary for Darwin to print out the apprioriate types of linker stubs
   std::set<std::string> FnStubs, GVStubs, LinkOnceStubs;
 
+  // Necessary for dllexport support
+  std::set<std::string> DLLExportedFns, DLLExportedGVs;
+  
   inline static bool isScale(const MachineOperand &MO) {
     return MO.isImmediate() &&
           (MO.getImmedValue() == 1 || MO.getImmedValue() == 2 ||