I landed: #if ENABLE(MALLOC_HEAP_BREAKDOWN) #error #endif by mistake.
<rdar://problem/104934833>
Pull request: https://github.com/WebKit/WebKit/pull/9488
Committed 259723@main (9e0ec1e87c86): <https://commits.webkit.org/259723@main> Reviewed commits have been landed. Closing PR #9488 and removing active labels.