[snapshot] Fix deref of raw pointer after potential GC

Fixes the one case after calling EnsureSourcePositionsCollected that we
were still using the non-handle version of the SharedFunctionInfo.

Bug: chromium:1048555
Change-Id: Iefd35fab13623a1f05212c98864be62c37463942
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2037437
Commit-Queue: Dan Elphick <delphick@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Auto-Submit: Dan Elphick <delphick@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66130}

src/snapshot/code-serializer.cc

@@ -341,7 +341,7 @@ MaybeHandle<SharedFunctionInfo> CodeSerializer::Deserialize(
               script->GetColumnNumber(shared_info->StartPosition()) + 1;
           PROFILE(isolate,
                   CodeCreateEvent(CodeEventListener::SCRIPT_TAG,
-                                  handle(info.abstract_code(), isolate),
+                                  handle(shared_info->abstract_code(), isolate),
                                   shared_info, name, line_num, column_num));
         }
       }