[turbofan] Improve constant-folding for typeof.

src/compiler/js-typed-lowering.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/js-typed-lowering.h"
 
 #include "src/ast/modules.h"
 #include "src/builtins/builtins-utils.h"
 #include "src/code-factory.h"
 #include "src/compilation-dependencies.h"
@@ skipping 836 matching lines @@
   Type* type = NodeProperties::GetType(input);
   Factory* const f = factory();
   if (type->Is(Type::Boolean())) {
     return Replace(jsgraph()->Constant(f->boolean_string()));
   } else if (type->Is(Type::Number())) {
     return Replace(jsgraph()->Constant(f->number_string()));
   } else if (type->Is(Type::String())) {
     return Replace(jsgraph()->Constant(f->string_string()));
   } else if (type->Is(Type::Symbol())) {
     return Replace(jsgraph()->Constant(f->symbol_string()));
-  } else if (type->Is(Type::Union(Type::Undefined(), Type::OtherUndetectable(),
-                                  graph()->zone()))) {
+  } else if (type->Is(Type::OtherUndetectableOrUndefined())) {
     return Replace(jsgraph()->Constant(f->undefined_string()));
-  } else if (type->Is(Type::Null())) {
+  } else if (type->Is(Type::NonCallableOrNull())) {
     return Replace(jsgraph()->Constant(f->object_string()));
   } else if (type->Is(Type::Function())) {
     return Replace(jsgraph()->Constant(f->function_string()));
   } else if (type->IsHeapConstant()) {
     return Replace(jsgraph()->Constant(
         Object::TypeOf(isolate(), type->AsHeapConstant()->Value())));
-  } else if (type->IsOtherNumberConstant()) {
-    return Replace(jsgraph()->Constant(f->number_string()));
   }
 
   return NoChange();
 }
 
 Reduction JSTypedLowering::ReduceJSEqualTypeOf(Node* node, bool invert) {
   Node* input;
   Handle<String> type;
   HeapObjectBinopMatcher m(node);
   if (m.left().IsJSTypeOf() && m.right().HasValue() &&
@@ skipping 1540 matching lines @@
 }
 
 
 CompilationDependencies* JSTypedLowering::dependencies() const {
   return dependencies_;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8