add support for external symbols.  The mc instprinter  can now handle
reasonable code like Codegen/ARM/2009-02-27-SpillerBug.ll, producing 
identical output except for superior formatting of constant pool entries.

llvm-svn: 84582
diff --git a/llvm/lib/Target/ARM/AsmPrinter/ARMMCInstLower.h b/llvm/lib/Target/ARM/AsmPrinter/ARMMCInstLower.h
index 1b73e81..383d30d 100644
--- a/llvm/lib/Target/ARM/AsmPrinter/ARMMCInstLower.h
+++ b/llvm/lib/Target/ARM/AsmPrinter/ARMMCInstLower.h
@@ -40,7 +40,7 @@
 
   //MCSymbol *GetPICBaseSymbol() const;
   MCSymbol *GetGlobalAddressSymbol(const MachineOperand &MO) const;
-  //MCSymbol *GetExternalSymbolSymbol(const MachineOperand &MO) const;
+  MCSymbol *GetExternalSymbolSymbol(const MachineOperand &MO) const;
   MCSymbol *GetJumpTableSymbol(const MachineOperand &MO) const;
   MCSymbol *GetConstantPoolIndexSymbol(const MachineOperand &MO) const;
   MCOperand LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const;