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8eda197502
`Perl_do_print`'s pre-existing method for stringification of an IV within an SVt_IV involves creating a temporary SVt_PV, using `sv_vcatpvfn_flags` to do the stringification, then freeing the SVt_PV once the buffer has been written out. This is considerably slower than using `uiv_2buf`, the helper function used by `sv_2pv_flags`. So this commit modifies `Perl_do_print` to use `uiv_2buf`.