Enable constant pool support.

src/heap-snapshot-generator.cc

Index: src/heap-snapshot-generator.cc
diff --git a/src/heap-snapshot-generator.cc b/src/heap-snapshot-generator.cc
index 929064489bc2115bc0bdaf009cb0cde42b290a46..38703784a3428c3b40b89b31b85ac07553ceaffa 100644
--- a/src/heap-snapshot-generator.cc
+++ b/src/heap-snapshot-generator.cc
@@ -1489,9 +1489,11 @@ void V8HeapExplorer::ExtractCodeReferences(int entry, Code* code) {
   SetInternalReference(code, entry,
                        "gc_metadata", code->gc_metadata(),
                        Code::kGCMetadataOffset);
-  SetInternalReference(code, entry,
-                       "constant_pool", code->constant_pool(),
-                       Code::kConstantPoolOffset);
+  if (FLAG_enable_ool_constant_pool) {
+    SetInternalReference(code, entry, "constant_pool",
+                         reinterpret_cast<Object*>(code->constant_pool()),
+                         Code::kConstantPoolOffset);
+  }
   if (code->kind() == Code::OPTIMIZED_FUNCTION) {
     SetWeakReference(code, entry,
                      "next_code_link", code->next_code_link(),