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/AST/ItaniumMangle.cpp b/lib/AST/ItaniumMangle.cpp
index 296bad5..ab6ec4e 100644
--- a/lib/AST/ItaniumMangle.cpp
+++ b/lib/AST/ItaniumMangle.cpp
@@ -1069,7 +1069,7 @@
   case DeclarationName::ObjCZeroArgSelector:
   case DeclarationName::ObjCOneArgSelector:
   case DeclarationName::ObjCMultiArgSelector:
-    assert(false && "Can't mangle Objective-C selector names here!");
+    llvm_unreachable("Can't mangle Objective-C selector names here!");
     break;
 
   case DeclarationName::CXXConstructorName:
@@ -1124,7 +1124,7 @@
     break;
 
   case DeclarationName::CXXUsingDirective:
-    assert(false && "Can't mangle a using directive name!");
+    llvm_unreachable("Can't mangle a using directive name!");
     break;
   }
 }
@@ -1512,7 +1512,7 @@
 
   case OO_None:
   case NUM_OVERLOADED_OPERATORS:
-    assert(false && "Not an overloaded operator");
+    llvm_unreachable("Not an overloaded operator");
     break;
   }
 }