[turbofan] Rip out the unused OsrGuard node.

src/compiler/bytecode-graph-builder.cc

 // Copyright 2015 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/bytecode-graph-builder.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/compiler-source-position-table.h"
@@ skipping 300 matching lines @@
   // Create OSR values for each environment value.
   SetContext(graph()->NewNode(
       common()->OsrValue(Linkage::kOsrContextSpillSlotIndex), entry));
   int size = static_cast<int>(values()->size());
   for (int i = 0; i < size; i++) {
     int idx = i;  // Indexing scheme follows {StandardFrame}, adapt accordingly.
     if (i >= register_base()) idx += InterpreterFrameConstants::kExtraSlotCount;
     if (i >= accumulator_base()) idx = Linkage::kOsrAccumulatorRegisterIndex;
     values()->at(i) = graph()->NewNode(common()->OsrValue(idx), entry);
   }
-
-  BailoutId loop_id(builder_->bytecode_iterator().current_offset());
-  Node* frame_state =
-      Checkpoint(loop_id, OutputFrameStateCombine::Ignore(), false, nullptr);
-  Node* checkpoint =
-      graph()->NewNode(common()->Checkpoint(), frame_state, entry, entry);
-  UpdateEffectDependency(checkpoint);
-
-  // Create the OSR guard nodes.
-  const Operator* guard_op = common()->OsrGuard(OsrGuardType::kUninitialized);
-  Node* effect = checkpoint;
-  for (int i = 0; i < size; i++) {
-    values()->at(i) = effect =
-        graph()->NewNode(guard_op, values()->at(i), effect, entry);
-  }
-  Node* context = effect = graph()->NewNode(guard_op, Context(), effect, entry);
-  SetContext(context);
-  UpdateEffectDependency(effect);
 }
 
 bool BytecodeGraphBuilder::Environment::StateValuesRequireUpdate(
     Node** state_values, Node** values, int count) {
   if (*state_values == nullptr) {
     return true;
   }
   Node::Inputs inputs = (*state_values)->inputs();
   if (inputs.count() != count) return true;
   for (int i = 0; i < count; i++) {
@@ skipping 2476 matching lines @@
         it->source_position().ScriptOffset(), start_position_.InliningId()));
     it->Advance();
   } else {
     DCHECK_GT(it->code_offset(), offset);
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8