fix comptime slicing not preserving comptime mutability

* fix comptime slice of slice not preserving mutatibility
   of the comptime data
 * fix comptime slice of pointer not preserving mutability
   of the comptime data

closes #826
1bf2810f33Andrew Kelley committed on 3/12/2018, 5:21:10 AMparent49c3922
2 files changedLine totals unavailable