Revert of [turbofan] Introduce CheckUnless.

src/compiler/typer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/typer.h"
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/common-operator.h"
@@ skipping 2021 matching lines @@
     }
   }
   return type;
 }
 
 Type* Typer::Visitor::TypeCheckIf(Node* node) {
   UNREACHABLE();
   return nullptr;
 }
 
-Type* Typer::Visitor::TypeCheckUnless(Node* node) {
-  UNREACHABLE();
-  return nullptr;
-}
-
 Type* Typer::Visitor::TypeTruncateTaggedToWord32(Node* node) {
   Type* arg = Operand(node, 0);
   // TODO(jarin): DCHECK(arg->Is(Type::NumberOrUndefined()));
   // Several mjsunit and cctest tests fail this check. For instance,
   // mjsunit/compiler/regress-607493 fails with Any/Any in simplified-lowering
   // (after propagation).
   return ChangeRepresentation(arg, Type::UntaggedIntegral32(), zone());
 }
 
 Type* Typer::Visitor::TypeAllocate(Node* node) { return Type::TaggedPointer(); }
@@ skipping 718 matching lines @@
   }
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8