Missing createPrimArray and createByteArray

[meooow25]

createArray and createSmallArray are handy functions, but the equivalents seems to be missing for PrimArray and ByteArray.

primitive/Data/Primitive/Array.hs

Lines 353 to 357 in 16421ca

	createArray
	:: Int
	-> a
	-> (forall s. MutableArray s a -> ST s ())
	-> Array a

primitive/Data/Primitive/SmallArray.hs

Lines 477 to 481 in 16421ca

	createSmallArray
	:: Int
	-> a
	-> (forall s. SmallMutableArray s a -> ST s ())
	-> SmallArray a

[andrewthad]

I agree. I would take a PR adding these.