* config/i386/i386.md (fix_trunc<MODEF:mode><SWI48:mode>_sse): Macroize
insn from fix_trunc<mode>{si,di}_sse using SWI48 mode iterator.
(peephole2 to avoid vector decoded forms): Macroize peephole2
using MODEF mode iterator. Use SWI48 mode iterator instead of SWI48x.