[Turbofan] Run loop peeling concurrently.

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 1524 matching lines @@
     // leave this scope below.
     Typer typer(isolate(), flags, data->graph());
     Run<TyperPhase>(&typer);
     RunPrintAndVerify("Typed");
 
     data->BeginPhaseKind("lowering");
 
     // Lower JSOperators where we can determine types.
     Run<TypedLoweringPhase>();
     RunPrintAndVerify("Lowered typed");
-
-    if (data->info()->is_loop_peeling_enabled()) {
-      Run<LoopPeelingPhase>();
-      RunPrintAndVerify("Loops peeled", true);
-    } else {
-      Run<LoopExitEliminationPhase>();
-      RunPrintAndVerify("Loop exits eliminated", true);
-    }
   }
 
   // Do some hacky things to prepare for the optimization phase.
   // (caching handles, etc.).
   Run<ConcurrentOptimizationPrepPhase>();
 
   data->EndPhaseKind();
 
   return true;
 }
 
 bool PipelineImpl::OptimizeGraph(Linkage* linkage) {
   PipelineData* data = this->data_;
 
+  if (data->info()->is_loop_peeling_enabled()) {
+    Run<LoopPeelingPhase>();
+    RunPrintAndVerify("Loops peeled", true);
+  } else {
+    Run<LoopExitEliminationPhase>();
+    RunPrintAndVerify("Loop exits eliminated", true);
+  }
+
   if (!data->is_asm()) {
     if (FLAG_turbo_load_elimination) {
       Run<LoadEliminationPhase>();
       RunPrintAndVerify("Load eliminated");
     }
 
     if (FLAG_turbo_escape) {
       Run<EscapeAnalysisPhase>();
       if (data->compilation_failed()) {
         info()->AbortOptimization(kCyclicObjectStateDetectedInEscapeAnalysis);
@@ skipping 433 matching lines @@
   data->DeleteRegisterAllocationZone();
 }
 
 CompilationInfo* PipelineImpl::info() const { return data_->info(); }
 
 Isolate* PipelineImpl::isolate() const { return info()->isolate(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8