Revert a mistake in Node::CollectProjections.

src/compiler/node.cc

 // Copyright 2013 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/node.h"
 
 #include "src/compiler/generic-node-inl.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 void Node::CollectProjections(NodeVector* projections) {
+  for (size_t i = 0; i < projections->size(); i++) {
+    (*projections)[i] = NULL;

[titzer, 2014/08/25 13:17:13]

I think you can use projections->at(i) here.

+  }
   for (UseIter i = uses().begin(); i != uses().end(); ++i) {
     if ((*i)->opcode() != IrOpcode::kProjection) continue;
-    DCHECK_GE(OpParameter<int32_t>(*i), 0);
-    projections->push_back(*i);
+    int32_t index = OpParameter<int32_t>(*i);
+    DCHECK_GE(index, 0);
+    DCHECK_LT(index, projections->size());
+    DCHECK_EQ(NULL, (*projections)[index]);
+    (*projections)[index] = *i;
   }
 }
 
 
 Node* Node::FindProjection(int32_t projection_index) {
   for (UseIter i = uses().begin(); i != uses().end(); ++i) {
     if ((*i)->opcode() == IrOpcode::kProjection &&
         OpParameter<int32_t>(*i) == projection_index) {
       return *i;
     }
@@ skipping 14 matching lines @@
       os << n.InputAt(i)->id();
     }
     os << ")";
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8