[turbofan] Variable liveness analysis for deopt

src/compiler/state-values-utils.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/state-values-utils.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 152 matching lines @@
   }
   if (count == 1) {
     return (*buffer)[0];
   } else {
     return GetValuesNodeFromCache(&(buffer->front()), count);
   }
 }
 
 
 Node* StateValuesCache::GetNodeForValues(Node** values, size_t count) {
+#if DEBUG
+  for (size_t i = 0; i < count; i++) {
+    DCHECK_NE(values[i]->opcode(), IrOpcode::kStateValues);
+  }
+#endif
   if (count == 0) {
     return GetEmptyStateValues();
   }
   size_t height = 0;
   size_t max_nodes = 1;
   while (count > max_nodes) {
     height++;
     max_nodes *= kMaxInputCount;
   }
 
@@ skipping 101 matching lines @@
     } else {
       count++;
     }
   }
   return count;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8