Split generated insn-emit.c

[jiejie_rong]

Hi,

        The size of generated file like insn-emit.c is very huge
        if we add lots of define_expand patten or define_insn patten.

        It’s present easily when there are much more intrinsic interfaces
        it costs much more time to create toolchain with compiling these files 
:(

        Does anyone have method to split the generated file to small pieces ?
        Or any hints to modify GCC toolchain creation process ?

Thanks,

—Jojo