handle fatal errors, rely on warnings to point out missing cases.

llvm-svn: 63913
diff --git a/clang/lib/Analysis/PathDiagnostic.cpp b/clang/lib/Analysis/PathDiagnostic.cpp
index d25c1b4..347bc92 100644
--- a/clang/lib/Analysis/PathDiagnostic.cpp
+++ b/clang/lib/Analysis/PathDiagnostic.cpp
@@ -29,10 +29,11 @@
   
   const char *LevelStr;
   switch (DiagLevel) {
-  default: assert(0 && "Unknown diagnostic type!");
+  case Diagnostic::Ignored: assert(0 && "Invalid diagnostic type");
   case Diagnostic::Note:    LevelStr = "note: "; break;
   case Diagnostic::Warning: LevelStr = "warning: "; break;
   case Diagnostic::Error:   LevelStr = "error: "; break;
+  case Diagnostic::Fatal:   LevelStr = "fatal error: "; break;
   }
 
   llvm::SmallString<100> StrC;