assert(0) -> LLVM_UNREACHABLE.
Make llvm_unreachable take an optional string, thus moving the cerr<< out of
line.
LLVM_UNREACHABLE is now a simple wrapper that makes the message go away for
NDEBUG builds.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75379 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Alpha/AlphaInstrInfo.cpp b/lib/Target/Alpha/AlphaInstrInfo.cpp
index 62b5d4c..139a4db 100644
--- a/lib/Target/Alpha/AlphaInstrInfo.cpp
+++ b/lib/Target/Alpha/AlphaInstrInfo.cpp
@@ -332,7 +332,7 @@
   case Alpha::FBLE: return Alpha::FBGT;
   case Alpha::FBLT: return Alpha::FBGE;
   default:
-    assert(0 && "Unknown opcode");
+    LLVM_UNREACHABLE("Unknown opcode");
   }
   return 0; // Not reached
 }