Convert assert(0) to llvm_unreachable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149967 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/MCJIT/MCJIT.cpp b/lib/ExecutionEngine/MCJIT/MCJIT.cpp
index 6982e74..5f93a8d 100644
--- a/lib/ExecutionEngine/MCJIT/MCJIT.cpp
+++ b/lib/ExecutionEngine/MCJIT/MCJIT.cpp
@@ -213,6 +213,5 @@
     }
   }
 
-  assert(0 && "Full-featured argument passing not supported yet!");
-  return GenericValue();
+  llvm_unreachable("Full-featured argument passing not supported yet!");
 }