[turbofan] Enable tail calls for %_CallFunction.

src/compiler/js-generic-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/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/js-generic-lowering.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 511 matching lines @@
   node->set_op(common()->Call(desc));
 }
 
 
 void JSGenericLowering::LowerJSCallFunction(Node* node) {
   const CallFunctionParameters& p = CallFunctionParametersOf(node->op());
   int arg_count = static_cast<int>(p.arity() - 2);
   CallFunctionStub stub(isolate(), arg_count, p.flags());
   CallInterfaceDescriptor d = stub.GetCallInterfaceDescriptor();
   CallDescriptor::Flags flags = AdjustFrameStatesForCall(node);
+  if (p.AllowTailCalls()) {
+    flags |= CallDescriptor::kSupportsTailCalls;
+  }
   CallDescriptor* desc = Linkage::GetStubCallDescriptor(
       isolate(), zone(), d, static_cast<int>(p.arity() - 1), flags);
   Node* stub_code = jsgraph()->HeapConstant(stub.GetCode());
   node->InsertInput(zone(), 0, stub_code);
   node->set_op(common()->Call(desc));
 }
 
 
 void JSGenericLowering::LowerJSCallRuntime(Node* node) {
   const CallRuntimeParameters& p = CallRuntimeParametersOf(node->op());
@@ skipping 264 matching lines @@
 }
 
 
 MachineOperatorBuilder* JSGenericLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8