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/Analysis/AliasSetTracker.cpp b/lib/Analysis/AliasSetTracker.cpp
index 18c2b66..7ba98dd 100644
--- a/lib/Analysis/AliasSetTracker.cpp
+++ b/lib/Analysis/AliasSetTracker.cpp
@@ -20,6 +20,7 @@
 #include "llvm/Target/TargetData.h"
 #include "llvm/Assembly/Writer.h"
 #include "llvm/Support/Compiler.h"
+#include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/InstIterator.h"
 #include "llvm/Support/Streams.h"
 using namespace llvm;
@@ -539,7 +540,7 @@
   case Refs    : OS << "Ref       "; break;
   case Mods    : OS << "Mod       "; break;
   case ModRef  : OS << "Mod/Ref   "; break;
-  default: assert(0 && "Bad value for AccessTy!");
+  default: LLVM_UNREACHABLE("Bad value for AccessTy!");
   }
   if (isVolatile()) OS << "[volatile] ";
   if (Forward)