[turbofan] Greedy: live range grouping.

src/compiler/register-allocator.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/base/adapters.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/register-allocator.h"
 #include "src/string-stream.h"
 
 namespace v8 {
@@ skipping 229 matching lines @@
       bits_(0),
       last_interval_(nullptr),
       first_interval_(nullptr),
       first_pos_(nullptr),
       top_level_(top_level),
       next_(nullptr),
       current_interval_(nullptr),
       last_processed_use_(nullptr),
       current_hint_position_(nullptr),
       size_(kInvalidSize),
-      weight_(kInvalidWeight) {
+      weight_(kInvalidWeight),
+      group_(nullptr) {
   DCHECK(AllocatedOperand::IsSupportedMachineType(machine_type));
   bits_ = AssignedRegisterField::encode(kUnassignedRegister) |
           MachineTypeField::encode(machine_type);
 }
 
 
 void LiveRange::Verify() const {
   // Walk the positions, verifying that each is in an interval.
   auto interval = first_interval_;
   for (auto pos = first_pos_; pos != nullptr; pos = pos->next()) {
@@ skipping 3058 matching lines @@
     auto eliminate = moves->PrepareInsertAfter(move);
     to_insert.push_back(move);
     if (eliminate != nullptr) to_eliminate.push_back(eliminate);
   }
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8