[turbofan] Optimize JSConvertReceiver if we know something about the receiver.

src/compiler/js-operator.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-operator.h"
 
 #include <limits>
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
@@ skipping 22 matching lines @@
 bool operator!=(VectorSlotPair const& lhs, VectorSlotPair const& rhs) {
   return !(lhs == rhs);
 }
 
 
 size_t hash_value(VectorSlotPair const& p) {
   return base::hash_combine(p.slot(), p.vector().location());
 }
 
 
-size_t hash_value(ConvertReceiverMode const& mode) {
+size_t hash_value(ConvertReceiverMode mode) {
   return base::hash_value(static_cast<int>(mode));
 }
 
 
-std::ostream& operator<<(std::ostream& os, ConvertReceiverMode const& mode) {
+std::ostream& operator<<(std::ostream& os, ConvertReceiverMode mode) {
   switch (mode) {
     case ConvertReceiverMode::kNullOrUndefined:
       return os << "NULL_OR_UNDEFINED";
     case ConvertReceiverMode::kNotNullOrUndefined:
       return os << "NOT_NULL_OR_UNDEFINED";
     case ConvertReceiverMode::kAny:
       return os << "ANY";
   }
   UNREACHABLE();
   return os;
 }
 
 
+ConvertReceiverMode ConvertReceiverModeOf(Operator const* op) {
+  DCHECK_EQ(IrOpcode::kJSConvertReceiver, op->opcode());
+  return OpParameter<ConvertReceiverMode>(op);
+}
+
+
 std::ostream& operator<<(std::ostream& os, CallFunctionParameters const& p) {
   os << p.arity() << ", " << p.flags() << ", " << p.language_mode();
   if (p.AllowTailCalls()) {
     os << ", ALLOW_TAIL_CALLS";
   }
   return os;
 }
 
 
 const CallFunctionParameters& CallFunctionParametersOf(const Operator* op) {
@@ skipping 694 matching lines @@
                                 Handle<ScopeInfo>::hash>(         // --
       IrOpcode::kJSCreateScriptContext, Operator::kNoProperties,  // opcode
       "JSCreateScriptContext",                                    // name
       1, 1, 1, 1, 1, 2,                                           // counts
       scpope_info);                                               // parameter
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8