Convert assert(0) to llvm_unreachable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149961 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/CppBackend/CPPBackend.cpp b/lib/Target/CppBackend/CPPBackend.cpp
index de8d8b7..76b5e9c 100644
--- a/lib/Target/CppBackend/CPPBackend.cpp
+++ b/lib/Target/CppBackend/CPPBackend.cpp
@@ -1356,7 +1356,7 @@
     case Instruction::PtrToInt: Out << "PtrToIntInst"; break;
     case Instruction::IntToPtr: Out << "IntToPtrInst"; break;
     case Instruction::BitCast:  Out << "BitCastInst"; break;
-    default: assert(0 && "Unreachable"); break;
+    default: llvm_unreachable("Unreachable");
     }
     Out << "(" << opNames[0] << ", "
         << getCppName(cst->getType()) << ", \"";