[crankshaft] Generate lazy bailout point for HProlog instruction only when it is necessary.

src/crankshaft/arm64/lithium-arm64.cc

 // Copyright 2013 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/crankshaft/arm64/lithium-arm64.h"
 
 #include <sstream>
 
 #include "src/crankshaft/arm64/lithium-codegen-arm64.h"
 #include "src/crankshaft/hydrogen-osr.h"
@@ skipping 696 matching lines @@
 #endif
 
   if (FLAG_stress_pointer_maps && !instr->HasPointerMap()) {
     instr = AssignPointerMap(instr);
   }
   if (FLAG_stress_environments && !instr->HasEnvironment()) {
     instr = AssignEnvironment(instr);
   }
   chunk_->AddInstruction(instr, current_block_);
 
-  if (instr->IsCall() || instr->IsPrologue()) {
+  if (instr->IsCall()) {
     HValue* hydrogen_value_for_lazy_bailout = hydrogen_val;
     if (hydrogen_val->HasObservableSideEffects()) {
       HSimulate* sim = HSimulate::cast(hydrogen_val->next());
       sim->ReplayEnvironment(current_block_->last_environment());
       hydrogen_value_for_lazy_bailout = sim;
     }
     LInstruction* bailout = AssignEnvironment(new(zone()) LLazyBailout());
     bailout->set_hydrogen_value(hydrogen_value_for_lazy_bailout);
     chunk_->AddInstruction(bailout, current_block_);
   }
 }
 
 
 LInstruction* LChunkBuilder::AssignEnvironment(LInstruction* instr) {
   HEnvironment* hydrogen_env = current_block_->last_environment();
   int argument_index_accumulator = 0;
   ZoneList<HValue*> objects_to_materialize(0, zone());
   instr->set_environment(CreateEnvironment(hydrogen_env,
                                            &argument_index_accumulator,
                                            &objects_to_materialize));
   return instr;
 }
 
 
 LInstruction* LChunkBuilder::DoPrologue(HPrologue* instr) {
-  return new (zone()) LPrologue();
+  LInstruction* result = new (zone()) LPrologue();
+  if (info_->num_heap_slots() > 0) {
+    result = MarkAsCall(result, instr);
+  }
+  return result;
 }
 
 
 LInstruction* LChunkBuilder::DoAbnormalExit(HAbnormalExit* instr) {
   // The control instruction marking the end of a block that completed
   // abruptly (e.g., threw an exception). There is nothing specific to do.
   return NULL;
 }
 
 
@@ skipping 1882 matching lines @@
 
 
 LInstruction* LChunkBuilder::DoStoreFrameContext(HStoreFrameContext* instr) {
   LOperand* context = UseRegisterAtStart(instr->context());
   return new(zone()) LStoreFrameContext(context);
 }
 
 
 }  // namespace internal
 }  // namespace v8