Three N_BIN/N_IDENT/N_CALL sites missed cases that bit ncurses
demos and dyn-linker exercises:
- Float compare emitted CMPQ + signed Jcc on f64 bits. Now goes
through UCOMISD/UCOMISS + the unsigned Jcc family, mirroring
Plan 9 6c (txt.c around AUCOMISD).
- LEAQ-of-fn-ident (taking the address of a function as a value)
used n->str without ffi_resolve, so binding a *fn from an
@symbol("name") fn declaration produced a reference to the
ww ident rather than the C symbol.
- N_CALL on a bare ident with no localfind hit was a direct
CALL ident(SB). Now checks localfind first and indirects
through AX when the callee names a local fn-pointer slot.
Hare/QBE handles both shapes the same way (sort/search.ha:15
calls cmp(...) where cmp is a *cmpfunc parameter).
