[turbofan] remove checks for virtual register overflow

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 <sstream>
 
 #include "src/base/platform/elapsed-timer.h"
@@ skipping 986 matching lines @@
     profiler_data->SetCode(&os);
 #endif
   }
 }
 
 
 void Pipeline::AllocateRegisters(const RegisterConfiguration* config,
                                  bool run_verifier) {
   PipelineData* data = this->data_;
 
-  int node_count = data->sequence()->VirtualRegisterCount();
-  if (node_count > UnallocatedOperand::kMaxVirtualRegisters) {
-    data->set_compilation_failed();
-    return;
-  }
-
   // Don't track usage for this zone in compiler stats.
   SmartPointer<Zone> verifier_zone;
   RegisterAllocatorVerifier* verifier = nullptr;
   if (run_verifier) {
     verifier_zone.Reset(new Zone(info()->isolate()));
     verifier = new (verifier_zone.get()) RegisterAllocatorVerifier(
         verifier_zone.get(), config, data->sequence());
   }
 
   SmartArrayPointer<char> debug_name;
@@ skipping 11 matching lines @@
   if (FLAG_trace_turbo_graph) {
     OFStream os(stdout);
     PrintableInstructionSequence printable = {config, data->sequence()};
     os << "----- Instruction sequence before register allocation -----\n"
        << printable;
   }
   if (verifier != nullptr) {
     CHECK(!data->register_allocator()->ExistsUseWithoutDefinition());
   }
   Run<AllocateGeneralRegistersPhase>();
-  if (!data->register_allocator()->AllocationOk()) {
-    data->set_compilation_failed();
-    return;
-  }
   Run<AllocateDoubleRegistersPhase>();
-  if (!data->register_allocator()->AllocationOk()) {
-    data->set_compilation_failed();
-    return;
-  }
   if (FLAG_turbo_reuse_spill_slots) {
     Run<ReuseSpillSlotsPhase>();
   }
   Run<CommitAssignmentPhase>();
   Run<PopulatePointerMapsPhase>();
   Run<ConnectRangesPhase>();
   Run<ResolveControlFlowPhase>();
   if (FLAG_turbo_move_optimization) {
     Run<OptimizeMovesPhase>();
   }
@@ skipping 22 matching lines @@
 }
 
 
 void Pipeline::TearDown() {
   InstructionOperand::TearDownCaches();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8