Fix invalid use of int in Zone.

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/compiler/linkage.h"
 #include "src/compiler/register-allocator.h"
 #include "src/string-stream.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 1496 matching lines @@
 
 class LiveRangeBoundArray {
  public:
   LiveRangeBoundArray() : length_(0), start_(nullptr) {}
 
   bool ShouldInitialize() { return start_ == nullptr; }
 
   void Initialize(Zone* zone, const LiveRange* const range) {
     size_t length = 0;
     for (auto i = range; i != nullptr; i = i->next()) length++;
-    start_ = zone->NewArray<LiveRangeBound>(static_cast<int>(length));
+    start_ = zone->NewArray<LiveRangeBound>(length);
     length_ = length;
     auto curr = start_;
     for (auto i = range; i != nullptr; i = i->next(), ++curr) {
       new (curr) LiveRangeBound(i);
     }
   }
 
   LiveRangeBound* Find(const LifetimePosition position) const {
     size_t left_index = 0;
     size_t right_index = length_;
@@ skipping 976 matching lines @@
   } else {
     DCHECK(range->Kind() == GENERAL_REGISTERS);
     assigned_registers_->Add(reg);
   }
   range->set_assigned_register(reg, operand_cache());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8