[turbofan] Add PlainPrimitiveToNumber simplified operator.

src/compiler/verifier.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/verifier.h"
 
 #include <deque>
 #include <queue>
 #include <sstream>
 #include <string>
@@ skipping 522 matching lines @@
     case IrOpcode::kNumberToInt32:
       // Number -> Signed32
       CheckValueInputIs(node, 0, Type::Number());
       CheckUpperIs(node, Type::Signed32());
       break;
     case IrOpcode::kNumberToUint32:
       // Number -> Unsigned32
       CheckValueInputIs(node, 0, Type::Number());
       CheckUpperIs(node, Type::Unsigned32());
       break;
+    case IrOpcode::kPlainPrimitiveToNumber:
+      // PlainPrimitive -> Number
+      CheckValueInputIs(node, 0, Type::PlainPrimitive());
+      CheckUpperIs(node, Type::Number());
+      break;
     case IrOpcode::kStringEqual:
     case IrOpcode::kStringLessThan:
     case IrOpcode::kStringLessThanOrEqual:
       // (String, String) -> Boolean
       CheckValueInputIs(node, 0, Type::String());
       CheckValueInputIs(node, 1, Type::String());
       CheckUpperIs(node, Type::Boolean());
       break;
     case IrOpcode::kStringAdd:
       // (String, String) -> String
@@ skipping 450 matching lines @@
     // Check inputs for all nodes in the block.
     for (size_t i = 0; i < block->NodeCount(); i++) {
       Node* node = block->NodeAt(i);
       CheckInputsDominate(schedule, block, node, static_cast<int>(i) - 1);
     }
   }
 }
 }
 }
 }  // namespace v8::internal::compiler