[JSC] LowerCase when LanguageTag checks duplicate variants
Created attachment 411037 [details] Patch
Created attachment 411038 [details] Patch
Comment on attachment 411038 [details] Patch r=me
Mac-debug-wk1's crash is known one and it is unrelated to this patch. iOS-wk2's ones are flaky from history information.
Committed r268318: <https://trac.webkit.org/changeset/268318> All reviewed patches have been landed. Closing bug and clearing flags on attachment 411038 [details].
<rdar://problem/70179908>