[turbofan] Improve constant-folding for typeof.

src/compiler/js-typed-lowering.cc

Index: src/compiler/js-typed-lowering.cc
diff --git a/src/compiler/js-typed-lowering.cc b/src/compiler/js-typed-lowering.cc
index 01775ced41ddb4f8598fe8234b475652fe3f81e1..fe676e9c407f88624eaa5f1b7662615d74b69398 100644
--- a/src/compiler/js-typed-lowering.cc
+++ b/src/compiler/js-typed-lowering.cc
@@ -854,18 +854,15 @@ Reduction JSTypedLowering::ReduceJSTypeOf(Node* node) {
     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();