[turbofan] Disable loop peeling for asm.js.

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 534 matching lines @@
 };
 
 PipelineCompilationJob::Status PipelineCompilationJob::PrepareJobImpl() {
   if (info()->shared_info()->asm_function()) {
     if (info()->osr_frame()) info()->MarkAsFrameSpecializing();
     info()->MarkAsFunctionContextSpecializing();
   } else {
     if (!FLAG_always_opt) {
       info()->MarkAsBailoutOnUninitialized();
     }
+    if (FLAG_turbo_loop_peeling) {
+      info()->MarkAsLoopPeelingEnabled();
+    }
   }
   if (info()->is_optimizing_from_bytecode() ||
       !info()->shared_info()->asm_function() || FLAG_turbo_asm_deoptimization) {
     info()->MarkAsDeoptimizationEnabled();
     if (FLAG_inline_accessors) {
       info()->MarkAsAccessorInliningEnabled();
     }
   }
   if (!info()->is_optimizing_from_bytecode()) {
     if (!Compiler::EnsureDeoptimizationSupport(info())) return FAILED;
@@ skipping 933 matching lines @@
     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 (FLAG_turbo_loop_peeling) {
+    if (data->info()->is_loop_peeling_enabled()) {
       Run<LoopPeelingPhase>();
       RunPrintAndVerify("Loops peeled", true);
     } else {
       Run<LoopExitEliminationPhase>();
       RunPrintAndVerify("Loop exits eliminated", true);
     }
 
     if (FLAG_turbo_stress_loop_peeling) {
       Run<StressLoopPeelingPhase>();
       RunPrintAndVerify("Loop peeled");
@@ skipping 426 matching lines @@
   data->DeleteRegisterAllocationZone();
 }
 
 CompilationInfo* PipelineImpl::info() const { return data_->info(); }
 
 Isolate* PipelineImpl::isolate() const { return info()->isolate(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8