[turbofan] Optimize typeof o === "object" checks.

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 885 matching lines @@
         graph()->NewNode(common()->Select(MachineRepresentation::kTagged),
                          graph()->NewNode(simplified()->ReferenceEqual(), input,
                                           jsgraph()->TrueConstant()),
                          jsgraph()->TrueConstant(),
                          graph()->NewNode(simplified()->ReferenceEqual(), input,
                                           jsgraph()->FalseConstant()));
   } else if (String::Equals(type, factory()->function_string())) {
     value = graph()->NewNode(simplified()->ObjectIsCallable(), input);
   } else if (String::Equals(type, factory()->number_string())) {
     value = graph()->NewNode(simplified()->ObjectIsNumber(), input);
+  } else if (String::Equals(type, factory()->object_string())) {
+    value = graph()->NewNode(
+        common()->Select(MachineRepresentation::kTagged),
+        graph()->NewNode(simplified()->ObjectIsNonCallable(), input),
+        jsgraph()->TrueConstant(),
+        graph()->NewNode(simplified()->ReferenceEqual(), input,
+                         jsgraph()->NullConstant()));
   } else if (String::Equals(type, factory()->string_string())) {
     value = graph()->NewNode(simplified()->ObjectIsString(), input);
   } else if (String::Equals(type, factory()->undefined_string())) {
     value = graph()->NewNode(
         common()->Select(MachineRepresentation::kTagged),
         graph()->NewNode(simplified()->ReferenceEqual(), input,
                          jsgraph()->NullConstant()),
         jsgraph()->FalseConstant(),
         graph()->NewNode(simplified()->ObjectIsUndetectable(), input));
   } else {
@@ skipping 1507 matching lines @@
 }
 
 
 CompilationDependencies* JSTypedLowering::dependencies() const {
   return dependencies_;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8