Implement changes from Chris's feedback.
Finish converting lib/Target.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75043 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Alpha/AlphaCodeEmitter.cpp b/lib/Target/Alpha/AlphaCodeEmitter.cpp
index 56f515e..9a7c5a4 100644
--- a/lib/Target/Alpha/AlphaCodeEmitter.cpp
+++ b/lib/Target/Alpha/AlphaCodeEmitter.cpp
@@ -235,10 +235,10 @@
     MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
                                                Alpha::reloc_bsr, MO.getMBB()));
   } else {
-    std::string msg;
-    raw_string_ostream Msg(msg);
-    Msg << "ERROR: Unknown type of MachineOperand: " << MO;
-    llvm_report_error(Msg.str());
+#ifndef NDEBUG
+    cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
+#endif
+    llvm_unreachable();
   }
 
   return rv;