Add an unreachable to silence warning - the switch is actually
fully enumerated.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117647 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 648b54a..f18bddf 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -797,6 +797,8 @@
   case Match_MnemonicFail:
     return Error(IDLoc, "unrecognized instruction mnemonic");
   }
+  
+  llvm_unreachable("Implement any new match types added!");
 }