[turbofan] Add support for tail-calling a runtime function with 6 arguments.

src/compiler/raw-machine-assembler.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/raw-machine-assembler.h"
 
 #include "src/code-factory.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/pipeline.h"
 #include "src/compiler/scheduler.h"
@@ skipping 384 matching lines @@
   Node* arity = Int32Constant(kArity);
 
   Node* nodes[] = {centry, arg1, arg2, arg3, arg4, arg5, ref, arity, context};
   Node* tail_call = MakeNode(common()->TailCall(desc), arraysize(nodes), nodes);
 
   schedule()->AddTailCall(CurrentBlock(), tail_call);
   current_block_ = nullptr;
   return tail_call;
 }
 
+Node* RawMachineAssembler::TailCallRuntime6(Runtime::FunctionId function,
+                                            Node* arg1, Node* arg2, Node* arg3,
+                                            Node* arg4, Node* arg5, Node* arg6,
+                                            Node* context) {
+  const int kArity = 6;
+  CallDescriptor* desc = Linkage::GetRuntimeCallDescriptor(
+      zone(), function, kArity, Operator::kNoProperties,
+      CallDescriptor::kSupportsTailCalls);
+  int return_count = static_cast<int>(desc->ReturnCount());
+
+  Node* centry = HeapConstant(CEntryStub(isolate(), return_count).GetCode());
+  Node* ref = AddNode(
+      common()->ExternalConstant(ExternalReference(function, isolate())));
+  Node* arity = Int32Constant(kArity);
+
+  Node* nodes[] = {centry, arg1, arg2, arg3,  arg4,
+                   arg5,   arg6, ref,  arity, context};
+  Node* tail_call = MakeNode(common()->TailCall(desc), arraysize(nodes), nodes);
+
+  schedule()->AddTailCall(CurrentBlock(), tail_call);
+  current_block_ = nullptr;
+  return tail_call;
+}
+
 Node* RawMachineAssembler::CallCFunction0(MachineType return_type,
                                           Node* function) {
   MachineSignature::Builder builder(zone(), 1, 0);
   builder.AddReturn(return_type);
   const CallDescriptor* descriptor =
       Linkage::GetSimplifiedCDescriptor(zone(), builder.Build());
 
   return AddNode(common()->Call(descriptor), function);
 }
 
@@ skipping 105 matching lines @@
   // The raw machine assembler nodes do not have effect and control inputs,
   // so we disable checking input counts here.
   return graph()->NewNodeUnchecked(op, input_count, inputs);
 }
 
 RawMachineLabel::~RawMachineLabel() { DCHECK(bound_ || !used_); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8