[turbofan] Add PlainPrimitiveToNumber simplified operator.

src/compiler/simplified-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/simplified-lowering.h"
 
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 727 matching lines @@
           if (lower()) DeferReplacement(node, node->InputAt(0));
         } else {
           // Require the input in float64 format and perform truncation.
           // TODO(turbofan): avoid a truncation with a smi check.
           VisitUnop(node, kTypeUint32 | kRepFloat64, kTypeUint32 | kRepWord32);
           if (lower())
             node->set_op(lowering->machine()->TruncateFloat64ToInt32());
         }
         break;
       }
+      case IrOpcode::kPlainPrimitiveToNumber: {
+        VisitUnop(node, kMachAnyTagged, kTypeNumber | kRepTagged);
+        if (lower()) {
+          // PlainPrimitiveToNumber(x) => Call(ToNumberStub, x, no-context)
+          Operator::Properties properties = node->op()->properties();
+          Callable callable = CodeFactory::ToNumber(jsgraph_->isolate());
+          CallDescriptor::Flags flags = CallDescriptor::kNoFlags;
+          CallDescriptor* desc = Linkage::GetStubCallDescriptor(
+              callable.descriptor(), 0, flags, properties, jsgraph_->zone());
+          node->set_op(jsgraph_->common()->Call(desc));
+          node->InsertInput(jsgraph_->zone(), 0,
+                            +jsgraph_->HeapConstant(callable.code()));
+          node->AppendInput(jsgraph_->zone(), jsgraph_->NoContextConstant());
+        }
+        break;
+      }
       case IrOpcode::kReferenceEqual: {
         VisitBinop(node, kMachAnyTagged, kRepBit);
         if (lower()) node->set_op(lowering->machine()->WordEqual());
         break;
       }
       case IrOpcode::kStringEqual: {
         VisitBinop(node, kMachAnyTagged, kRepBit);
         if (lower()) lowering->DoStringEqual(node);
         break;
       }
@@ skipping 750 matching lines @@
 
 void SimplifiedLowering::DoStringLessThanOrEqual(Node* node) {
   node->set_op(machine()->IntLessThanOrEqual());
   node->ReplaceInput(0, StringComparison(node, true));
   node->ReplaceInput(1, jsgraph()->SmiConstant(EQUAL));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8