[turbofan] Remove support for LazyBailout operators.

src/compiler/ast-graph-builder.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/ast-graph-builder.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
@@ skipping 1431 matching lines @@
   try_control.BeginTry();
   {
     ControlScopeForCatch scope(this, &try_control);
     STATIC_ASSERT(TryBlockConstant::kElementCount == 1);
     environment()->Push(current_context());
     Visit(stmt->try_block());
     environment()->Pop();
   }
   try_control.EndTry();
 
-  // Insert lazy bailout point.
-  // TODO(mstarzinger): We are only using a 'call' to get a lazy bailout
-  // point. Ideally, we whould not re-enter optimized code when deoptimized
-  // lazily. Tracked by issue v8:4195.
-  NewNode(common()->LazyBailout(),
-          jsgraph()->ZeroConstant(),                      // dummy target.
-          environment()->Checkpoint(stmt->HandlerId()));  // frame state.
-
   // Clear message object as we enter the catch block.
   Node* the_hole = jsgraph()->TheHoleConstant();
   NewNode(javascript()->StoreMessage(), the_hole);
 
   // Create a catch scope that binds the exception.
   Node* exception = try_control.GetExceptionNode();
   Handle<String> name = stmt->variable()->name();
   const Operator* op = javascript()->CreateCatchContext(name);
   Node* context = NewNode(op, exception, GetFunctionClosureForContext());
 
@@ skipping 24 matching lines @@
   try_control.BeginTry();
   {
     ControlScopeForFinally scope(this, commands, &try_control);
     STATIC_ASSERT(TryBlockConstant::kElementCount == 1);
     environment()->Push(current_context());
     Visit(stmt->try_block());
     environment()->Pop();
   }
   try_control.EndTry(commands->GetFallThroughToken(), fallthrough_result);
 
-  // Insert lazy bailout point.
-  // TODO(mstarzinger): We are only using a 'call' to get a lazy bailout
-  // point. Ideally, we whould not re-enter optimized code when deoptimized
-  // lazily. Tracked by issue v8:4195.
-  NewNode(common()->LazyBailout(),
-          jsgraph()->ZeroConstant(),                      // dummy target.
-          environment()->Checkpoint(stmt->HandlerId()));  // frame state.
-
   // The result value semantics depend on how the block was entered:
   //  - ReturnStatement: It represents the return value being returned.
   //  - ThrowStatement: It represents the exception being thrown.
   //  - BreakStatement/ContinueStatement: Filled with the hole.
   //  - Falling through into finally-block: Filled with the hole.
   Node* result = try_control.GetResultValueNode();
   Node* token = try_control.GetDispatchTokenNode();
 
   // The result value, dispatch token and message is expected on the operand
   // stack (this is in sync with FullCodeGenerator::EnterFinallyBlock).
@@ skipping 2843 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8