C backend: Improve lowering of Zig types to C types

1. Changed Zig pointers to functions to be typedef'd so then we can
   treat them the same as other types.

2. Distinguished between const slices (zig_L prefix) and mut slices
   (zig_M prefix).

3. Changed lowering of Zig "const pointers" (e.g. *const u8) to to C
   "pointers to const" (e.g. const char *) rather than C "const
   pointers" (e.g.  char * const)

4. Ensured that all typedefs are "linked" even if the decl doesn't
   require any forward declarations

5. Added test that exercises function pointer type rendering

6. Changed .slice_ptr instruction to allocate pointer local rather than
   a uintptr_t local

0 files changed, 0 insertions, 0 deletions