[turbofan] Introduce PlainPrimitiveToNumber.

test/unittests/compiler/js-typed-lowering-unittest.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/code-factory.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 303 matching lines @@
 
 TEST_F(JSTypedLoweringTest, JSToNumberWithPlainPrimitive) {
   Node* const input = Parameter(Type::PlainPrimitive(), 0);
   Node* const context = Parameter(Type::Any(), 1);
   Node* const effect = graph()->start();
   Node* const control = graph()->start();
   Reduction r =
       Reduce(graph()->NewNode(javascript()->ToNumber(), input, context,
                               EmptyFrameState(), effect, control));
   ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(r.replacement(), IsToNumber(input, IsNumberConstant(BitEq(0.0)),
-                                          graph()->start(), control));
+  EXPECT_THAT(r.replacement(), IsPlainPrimitiveToNumber(input));
 }
 
 
 // -----------------------------------------------------------------------------
 // JSToObject
 
 
 TEST_F(JSTypedLoweringTest, JSToObjectWithAny) {
   Node* const input = Parameter(Type::Any(), 0);
   Node* const context = Parameter(Type::Any(), 1);
@@ skipping 610 matching lines @@
   Node* dummy = graph()->NewNode(javascript()->ToObject(), instanceOf, context,
                                  frame_state, effect, control);
   Reduction r = Reduce(instanceOf);
   ASSERT_FALSE(r.Changed());
   ASSERT_EQ(instanceOf, dummy->InputAt(0));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8