[turbofan] Fix tail call optimization.

src/compiler/schedule.cc

 // Copyright 2013 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/schedule.h"
 
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties.h"
 #include "src/ostreams.h"
 
@@ skipping 90 matching lines @@
     case BasicBlock::kGoto:
       return os << "goto";
     case BasicBlock::kCall:
       return os << "call";
     case BasicBlock::kBranch:
       return os << "branch";
     case BasicBlock::kSwitch:
       return os << "switch";
     case BasicBlock::kDeoptimize:
       return os << "deoptimize";
+    case BasicBlock::kTailCall:
+      return os << "tailcall";
     case BasicBlock::kReturn:
       return os << "return";
     case BasicBlock::kThrow:
       return os << "throw";
   }
   UNREACHABLE();
   return os;
 }
 
 
@@ skipping 105 matching lines @@
   DCHECK_EQ(BasicBlock::kNone, block->control());
   DCHECK_EQ(IrOpcode::kSwitch, sw->opcode());
   block->set_control(BasicBlock::kSwitch);
   for (size_t index = 0; index < succ_count; ++index) {
     AddSuccessor(block, succ_blocks[index]);
   }
   SetControlInput(block, sw);
 }
 
 
+void Schedule::AddTailCall(BasicBlock* block, Node* input) {
+  DCHECK_EQ(BasicBlock::kNone, block->control());
+  block->set_control(BasicBlock::kTailCall);
+  SetControlInput(block, input);
+  if (block != end()) AddSuccessor(block, end());
+}
+
+
 void Schedule::AddReturn(BasicBlock* block, Node* input) {
   DCHECK_EQ(BasicBlock::kNone, block->control());
   block->set_control(BasicBlock::kReturn);
   SetControlInput(block, input);
   if (block != end()) AddSuccessor(block, end());
 }
 
 
 void Schedule::AddDeoptimize(BasicBlock* block, Node* input) {
   DCHECK_EQ(BasicBlock::kNone, block->control());
@@ skipping 118 matching lines @@
       }
       os << "\n";
     }
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8