[turbofan] Use Node input iterators where possible

src/compiler/escape-analysis-reducer.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/escape-analysis-reducer.h"
 
 #include "src/compiler/all-nodes.h"
 #include "src/compiler/js-graph.h"
 #include "src/counters.h"
 
@@ skipping 43 matching lines @@
       return ReduceObjectIsSmi(node);
     // FrameStates and Value nodes are preprocessed here,
     // and visited via ReduceFrameStateUses from their user nodes.
     case IrOpcode::kFrameState:
     case IrOpcode::kStateValues: {
       if (node->id() >= static_cast<NodeId>(fully_reduced_.length()) ||
           fully_reduced_.Contains(node->id())) {
         break;
       }
       bool depends_on_object_state = false;
-      for (int i = 0; i < node->InputCount(); i++) {
-        Node* input = node->InputAt(i);
+      for (Node* input : node->inputs()) {
         switch (input->opcode()) {
           case IrOpcode::kAllocate:
           case IrOpcode::kFinishRegion:
             depends_on_object_state =
                 depends_on_object_state || escape_analysis()->IsVirtual(input);
             break;
           case IrOpcode::kFrameState:
           case IrOpcode::kStateValues:
             depends_on_object_state =
                 depends_on_object_state ||
@@ skipping 294 matching lines @@
     }
   }
 #endif  // DEBUG
 }
 
 Isolate* EscapeAnalysisReducer::isolate() const { return jsgraph_->isolate(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8