[debugger] fix crash in debug-evaluate when retrieving values in TDZ.

src/debug/debug-evaluate.cc

Index: src/debug/debug-evaluate.cc
diff --git a/src/debug/debug-evaluate.cc b/src/debug/debug-evaluate.cc
index 1134c9dd68ae9cfec97deb3a1bed09c7663a6d61..8114c21fe856842c40ca63aa64edfdd4e1e4cd78 100644
--- a/src/debug/debug-evaluate.cc
+++ b/src/debug/debug-evaluate.cc
@@ -346,6 +346,7 @@ void DebugEvaluate::ContextBuilder::MaterializeContextChain(
       // within debug-evaluate.
       continue;
     }
+    if (value->IsTheHole()) continue;  // Value is not initialized yet (in TDZ).
     JSObject::SetOwnPropertyIgnoreAttributes(target, name, value, NONE).Check();
   }
 }