Revert of [turbofan] Osr value typing + dynamic type checks on entry.

src/compiler/pipeline.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/pipeline.h"
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <memory>
 #include <sstream>
 
@@ skipping 841 matching lines @@
   void Run(PipelineData* data, Zone* temp_zone, Typer* typer) {
     NodeVector roots(temp_zone);
     data->jsgraph()->GetCachedNodes(&roots);
     LoopVariableOptimizer induction_vars(data->jsgraph()->graph(),
                                          data->common(), temp_zone);
     if (FLAG_turbo_loop_variable) induction_vars.Run();
     typer->Run(roots, &induction_vars);
   }
 };
 
-struct OsrTyperPhase {
-  static const char* phase_name() { return "osr typer"; }
-
-  void Run(PipelineData* data, Zone* temp_zone) {
-    NodeVector roots(temp_zone);
-    data->jsgraph()->GetCachedNodes(&roots);
-    // Dummy induction variable optimizer: at the moment, we do not try
-    // to compute loop variable bounds on OSR.
-    LoopVariableOptimizer induction_vars(data->jsgraph()->graph(),
-                                         data->common(), temp_zone);
-    Typer typer(data->isolate(), data->graph());
-    typer.Run(roots, &induction_vars);
-  }
-};
+#ifdef DEBUG
 
 struct UntyperPhase {
   static const char* phase_name() { return "untyper"; }
 
   void Run(PipelineData* data, Zone* temp_zone) {
     class RemoveTypeReducer final : public Reducer {
      public:
       Reduction Reduce(Node* node) final {
         if (NodeProperties::IsTyped(node)) {
           NodeProperties::RemoveType(node);
           return Changed(node);
         }
         return NoChange();
       }
     };
 
-    NodeVector roots(temp_zone);
-    data->jsgraph()->GetCachedNodes(&roots);
-    for (Node* node : roots) {
-      NodeProperties::RemoveType(node);
-    }
-
     JSGraphReducer graph_reducer(data->jsgraph(), temp_zone);
     RemoveTypeReducer remove_type_reducer;
     AddReducer(data, &graph_reducer, &remove_type_reducer);
     graph_reducer.ReduceGraph();
   }
 };
 
+#endif  // DEBUG
+
 struct OsrDeconstructionPhase {
   static const char* phase_name() { return "OSR deconstruction"; }
 
   void Run(PipelineData* data, Zone* temp_zone) {
-    GraphTrimmer trimmer(temp_zone, data->graph());
-    NodeVector roots(temp_zone);
-    data->jsgraph()->GetCachedNodes(&roots);
-    trimmer.TrimGraph(roots.begin(), roots.end());
-
     OsrHelper osr_helper(data->info());
     osr_helper.Deconstruct(data->jsgraph(), data->common(), temp_zone);
   }
 };
 
 
 struct TypedLoweringPhase {
   static const char* phase_name() { return "typed lowering"; }
 
   void Run(PipelineData* data, Zone* temp_zone) {
@@ skipping 584 matching lines @@
 
   Run<GraphBuilderPhase>();
   if (data->compilation_failed()) {
     data->EndPhaseKind();
     return false;
   }
   RunPrintAndVerify("Initial untyped", true);
 
   // Perform OSR deconstruction.
   if (info()->is_osr()) {
-    Run<OsrTyperPhase>();
-
     Run<OsrDeconstructionPhase>();
-
-    Run<UntyperPhase>();
     RunPrintAndVerify("OSR deconstruction", true);
   }
 
   // Perform function context specialization and inlining (if enabled).
   Run<InliningPhase>();
   RunPrintAndVerify("Inlined", true);
 
   // Remove dead->live edges from the graph.
   Run<EarlyGraphTrimmingPhase>();
   RunPrintAndVerify("Early trimmed", true);
@@ skipping 435 matching lines @@
   data->DeleteRegisterAllocationZone();
 }
 
 CompilationInfo* PipelineImpl::info() const { return data_->info(); }
 
 Isolate* PipelineImpl::isolate() const { return info()->isolate(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8