Use raw_ostream throughout the AsmPrinter.

llvm-svn: 55092
diff --git a/llvm/lib/Target/Alpha/Alpha.h b/llvm/lib/Target/Alpha/Alpha.h
index d69d1b7..f62270d 100644
--- a/llvm/lib/Target/Alpha/Alpha.h
+++ b/llvm/lib/Target/Alpha/Alpha.h
@@ -23,9 +23,10 @@
   class FunctionPass;
   class TargetMachine;
   class MachineCodeEmitter;
+  class raw_ostream;
 
   FunctionPass *createAlphaISelDag(AlphaTargetMachine &TM);
-  FunctionPass *createAlphaCodePrinterPass(std::ostream &OS,
+  FunctionPass *createAlphaCodePrinterPass(raw_ostream &OS,
                                              TargetMachine &TM);
   FunctionPass *createAlphaPatternInstructionSelector(TargetMachine &TM);
   FunctionPass *createAlphaCodeEmitterPass(AlphaTargetMachine &TM,