This was tripping an assertion failure on the invalid use of the dataMemoryTempRegister during a Debug build JSC stress test run with DoesGC validation enabled.
Created attachment 417155 [details] proposed patch.
Comment on attachment 417155 [details] proposed patch. r=me
Comment on attachment 417155 [details] proposed patch. Thanks for the review. Landing now.
Committed r271226: <https://trac.webkit.org/changeset/271226> All reviewed patches have been landed. Closing bug and clearing flags on attachment 417155 [details].
<rdar://problem/72880074>