wwstage's typeeqast lacked the identity short-circuit cstage type_eq
opens with (cmd/wcc/type.c:250 `if (a == b) return 1`). Enum/struct/
array type nodes are shared from their decl, so two references to the
same type resolve to one node; without the fast-path the catch-all
returns false. Exposed by #26's integer-mismatch reject, which fired
on a same-enum binop like w6l's `os.flag.WRONLY|CREATE|TRUNC` that
cstage accepts via this check. Corpus output unchanged (the w6c_ww/
wwdump_ww binaries move because check.ww regenerates combined.ww).
Hojun-Cho
391ef61d42