YJIT: Fix String#<< return type
We previously falsely asserted that String#<< always returns a ::String instance. Issue was discovered on CI with --yjit-verify-ctx.
--yjit-verify-ctx
https://github.com/ruby/ruby/actions/runs/5893760435/job/15986002531
YJIT: Fix String#<< return type
We previously falsely asserted that String#<< always returns a ::String
instance. Issue was discovered on CI with
--yjit-verify-ctx
.https://github.com/ruby/ruby/actions/runs/5893760435/job/15986002531