Switch assert(0/false) llvm_unreachable.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140367 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDeclObjC.cpp b/lib/Sema/SemaDeclObjC.cpp
index 94de799..5a1ce28 100644
--- a/lib/Sema/SemaDeclObjC.cpp
+++ b/lib/Sema/SemaDeclObjC.cpp
@@ -1664,7 +1664,7 @@
       DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap);      
     } 
   } else
-    assert(false && "invalid ObjCContainerDecl type.");
+    llvm_unreachable("invalid ObjCContainerDecl type.");
 }
 
 /// ActOnForwardClassDeclaration -