[stubs]: Support 1->2 byte copies in CopyStringCharacters

src/compiler/code-assembler.cc

 // Copyright 2015 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/code-assembler.h"
 
 #include <ostream>
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
@@ skipping 1048 matching lines @@
 }
 
 MachineRepresentation CodeAssembler::Variable::rep() const {
   return impl_->rep_;
 }
 
 bool CodeAssembler::Variable::IsBound() const {
   return impl_->value_ != nullptr;
 }
 
-CodeAssembler::Label::Label(CodeAssembler* assembler, int merged_value_count,
-                            CodeAssembler::Variable** merged_variables,
-                            CodeAssembler::Label::Type type)
+CodeAssembler::Label::Label(CodeAssembler* assembler, size_t vars_count,
+                            Variable** vars, CodeAssembler::Label::Type type)
     : bound_(false), merge_count_(0), assembler_(assembler), label_(nullptr) {
   void* buffer = assembler->zone()->New(sizeof(RawMachineLabel));
   label_ = new (buffer)
       RawMachineLabel(type == kDeferred ? RawMachineLabel::kDeferred
                                         : RawMachineLabel::kNonDeferred);
-  for (int i = 0; i < merged_value_count; ++i) {
-    variable_phis_[merged_variables[i]->impl_] = nullptr;
+  for (size_t i = 0; i < vars_count; ++i) {
+    variable_phis_[vars[i]->impl_] = nullptr;
   }
 }
 
 void CodeAssembler::Label::MergeVariables() {
   ++merge_count_;
   for (auto var : assembler_->variables_) {
     size_t count = 0;
     Node* node = var->value_;
     if (node != nullptr) {
       auto i = variable_merges_.find(var);
@@ skipping 88 matching lines @@
       }
     }
   }
 
   bound_ = true;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8