[turbofan] Introduce JSCallForwardVarargs operator.

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 100 matching lines @@
      << p.tail_call_mode();
   return os;
 }
 
 
 const CallFunctionParameters& CallFunctionParametersOf(const Operator* op) {
   DCHECK_EQ(IrOpcode::kJSCallFunction, op->opcode());
   return OpParameter<CallFunctionParameters>(op);
 }
 
+std::ostream& operator<<(std::ostream& os,
+                         CallForwardVarargsParameters const& p) {
+  return os << p.start_index() << ", " << p.tail_call_mode();
+}
+
+CallForwardVarargsParameters const& CallForwardVarargsParametersOf(
+    Operator const* op) {
+  DCHECK_EQ(IrOpcode::kJSCallForwardVarargs, op->opcode());
+  return OpParameter<CallForwardVarargsParameters>(op);
+}
+
 bool operator==(CallFunctionWithSpreadParameters const& lhs,
                 CallFunctionWithSpreadParameters const& rhs) {
   return lhs.arity() == rhs.arity();
 }
 
 bool operator!=(CallFunctionWithSpreadParameters const& lhs,
                 CallFunctionWithSpreadParameters const& rhs) {
   return !(lhs == rhs);
 }
 
@@ skipping 586 matching lines @@
 
 const Operator* JSOperatorBuilder::ToBoolean(ToBooleanHints hints) {
   // TODO(turbofan): Cache most important versions of this operator.
   return new (zone()) Operator1<ToBooleanHints>(  //--
       IrOpcode::kJSToBoolean, Operator::kPure,    // opcode
       "JSToBoolean",                              // name
       1, 0, 0, 1, 0, 0,                           // inputs/outputs
       hints);                                     // parameter
 }
 
+const Operator* JSOperatorBuilder::CallForwardVarargs(
+    uint32_t start_index, TailCallMode tail_call_mode) {
+  CallForwardVarargsParameters parameters(start_index, tail_call_mode);
+  return new (zone()) Operator1<CallForwardVarargsParameters>(   // --
+      IrOpcode::kJSCallForwardVarargs, Operator::kNoProperties,  // opcode
+      "JSCallForwardVarargs",                                    // name
+      2, 1, 1, 1, 1, 2,                                          // counts
+      parameters);                                               // parameter
+}
+
 const Operator* JSOperatorBuilder::CallFunction(
     size_t arity, float frequency, VectorSlotPair const& feedback,
     ConvertReceiverMode convert_mode, TailCallMode tail_call_mode) {
   CallFunctionParameters parameters(arity, frequency, feedback, tail_call_mode,
                                     convert_mode);
   return new (zone()) Operator1<CallFunctionParameters>(   // --
       IrOpcode::kJSCallFunction, Operator::kNoProperties,  // opcode
       "JSCallFunction",                                    // name
       parameters.arity(), 1, 1, 1, 1, 2,                   // inputs/outputs
       parameters);                                         // parameter
@@ skipping 303 matching lines @@
   return new (zone()) Operator1<Handle<ScopeInfo>>(               // --
       IrOpcode::kJSCreateScriptContext, Operator::kNoProperties,  // opcode
       "JSCreateScriptContext",                                    // name
       1, 1, 1, 1, 1, 2,                                           // counts
       scope_info);                                                // parameter
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8