add more jl_is_int in julia.h

[armgong]

julia have many integer type like int8 int16 uint8 uint16,but in julia.h no jl_is_int8 or jl_is_int16,so request add to julia.h

define jl_is_int8(v) jl_typeis(v,jl_int8_type)

define jl_is_int16(v) jl_typeis(v,jl_int16_type)

define jl_is_uint8(v) jl_typeis(v,jl_uint8_type)

define jl_is_uint16(v) jl_typeis(v,jl_uint16_type)

[StefanKarpinski]

Seems to me that the rhs of each of these is quite easy to write.

[armgong]

yes,it is so easy,I can define these in my c code ,but I think it is better add to julia.h

[tknopp]

Stefans point was that is so easy that it might not be worth introducing these macros.

But as we already have these functions for int32/int64 I think it is ok to add them for consistency reasons.