abi: add AddressSpace field to Primitive::Pointer

...and remove it from `PointeeInfo`, which isn't meant for this.

There are still various places (marked with FIXMEs) that assume all pointers
have the same size and alignment. Fixing this requires parsing non-default
address spaces in the data layout string, which will be done in a followup.

src/common.rs

@@ -35,7 +35,8 @@ pub(crate) fn scalar_to_clif_type(tcx: TyCtxt<'_>, scalar: Scalar) -> Type {
         },
         Primitive::F32 => types::F32,
         Primitive::F64 => types::F64,
-        Primitive::Pointer => pointer_ty(tcx),
+        // FIXME(erikdesjardins): handle non-default addrspace ptr sizes
+        Primitive::Pointer(_) => pointer_ty(tcx),
     }
 }