Correctly annotate eval origin.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 58b860874bf46de3f0bcec742d866d5b95dd8cd1..187db39aaae9660330dbef3ba899114c6790f719 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -766,10 +766,10 @@ void Heap::PreprocessStackTraces() {
       // If GC happens while adding a stack trace to the weak fixed array,
       // which has been copied into a larger backing store, we may run into
       // a stack trace that has already been preprocessed. Guard against this.
-      if (!maybe_code->IsCode()) break;
-      Code* code = Code::cast(maybe_code);
+      if (!maybe_code->IsAbstractCode()) break;
+      AbstractCode* abstract_code = AbstractCode::cast(maybe_code);
       int offset = Smi::cast(elements->get(j + 3))->value();
-      int pos = code->SourcePosition(offset);
+      int pos = abstract_code->SourcePosition(offset);
       elements->set(j + 2, Smi::FromInt(pos));
     }
   }