[heap] Fix broken DCHECK in FlushBytecodeFromSFI

The String might be in the shared heap which is not collected during
client GCs.

Bug: v8:11708
Change-Id: I0958c46996a2aeba3a046263350617e8d177deca
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3805883Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82179}

src/heap/mark-compact.cc

@@ -3014,7 +3014,8 @@ void MarkCompactCollector::FlushBytecodeFromSFI(
 
   // Mark the uncompiled data as black, and ensure all fields have already been
   // marked.
-  DCHECK(marking_state()->IsBlackOrGrey(inferred_name));
+  DCHECK(marking_state()->IsBlackOrGrey(inferred_name) ||
+         (!is_shared_heap() && inferred_name.InSharedWritableHeap()));
   marking_state()->WhiteToBlack(uncompiled_data);
 
   // Use the raw function data setter to avoid validity checks, since we're