[turbofan] Use appropriate type for NodeId.

src/compiler/osr.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.h"
 #include "src/compiler/all-nodes.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/control-reducer.h"
 #include "src/compiler/frame.h"
 #include "src/compiler/graph.h"
@@ skipping 26 matching lines @@
     if (TRACE_COND) PrintF(__VA_ARGS__); \
   } while (false)
 
 
 // Peel outer loops and rewire the graph so that control reduction can
 // produce a properly formed graph.
 static void PeelOuterLoopsForOsr(Graph* graph, CommonOperatorBuilder* common,
                                  Zone* tmp_zone, Node* dead,
                                  LoopTree* loop_tree, LoopTree::Loop* osr_loop,
                                  Node* osr_normal_entry, Node* osr_loop_entry) {
-  const int original_count = graph->NodeCount();
+  const size_t original_count = graph->NodeCount();
   AllNodes all(tmp_zone, graph);
   NodeVector tmp_inputs(tmp_zone);
   Node* sentinel = graph->NewNode(dead->op());
 
   // Make a copy of the graph for each outer loop.
   ZoneVector<NodeVector*> copies(tmp_zone);
   for (LoopTree::Loop* loop = osr_loop->parent(); loop; loop = loop->parent()) {
     void* stuff = tmp_zone->New(sizeof(NodeVector));
     NodeVector* mapping =
         new (stuff) NodeVector(original_count, sentinel, tmp_zone);
@@ skipping 290 matching lines @@
   // the first spill slots.
   frame->ReserveSpillSlots(UnoptimizedFrameSlots());
   // The frame needs to be adjusted by the number of unoptimized frame slots.
   frame->SetOsrStackSlotCount(static_cast<int>(UnoptimizedFrameSlots()));
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8