[turbofan] Use appropriate type for NodeId.

src/compiler/loop-analysis.h

Index: src/compiler/loop-analysis.h
diff --git a/src/compiler/loop-analysis.h b/src/compiler/loop-analysis.h
index 77c2a95928c5e6083a61d11cbe3f3450439ba9c1..1a06b666dd252291e58d679d2446bac801a5cf27 100644
--- a/src/compiler/loop-analysis.h
+++ b/src/compiler/loop-analysis.h
@@ -63,8 +63,7 @@ class LoopTree : public ZoneObject {
 
   // Return the innermost nested loop, if any, that contains {node}.
   Loop* ContainingLoop(Node* node) {
-    if (node->id() >= static_cast<int>(node_to_loop_num_.size()))
-      return nullptr;
+    if (node->id() >= node_to_loop_num_.size()) return nullptr;
     int num = node_to_loop_num_[node->id()];
     return num > 0 ? &all_loops_[num - 1] : nullptr;
   }