Change Details

`dtrace_instr_size()` is needed by the forthcoming RISC-V port of kinst, as well as by libdtrace in D38825 for both amd64 and RISC-V.

`dtrace_instr_size()` is needed by the forthcoming RISC-V port of kinst, as well as by libdtrace in D38825 for both amd64 and RISC-V. Also make the types `uint8_t` instead of `uchar_t`.

`dtrace_instr_size()` is needed by the forthcoming RISC-V port of kinst, as well as by libdtrace in D38825 for both amd64 and RISC-V. Also make the types `uint8_t` instead of `uchar_t`.