YJIT: ZJIT: Crash in `intern`

[tekknolagi]

From @eregon:

The last sync of ruby/spec revealed that both YJIT and ZJIT crash with We are killing the stack canary set by intern on

:"#{(+"\xFF").force_encoding(Encoding::UTF_8)}"
%I[#{(+"\xFF").force_encoding(Encoding::UTF_8)}]

The 2 specs:

• ruby/spec@5373e84
• ruby/spec@c27dd75

[rafaelfranca]

Done in ruby#18716