pointer math fails to modify alignment of type

[andrewrk]

const std = @import("std");

test "aoeu" {
    var arr: [10]u8 align(2) = undefined;
    var x: usize = 1;

    const ptr = ([*]u8)(&arr);
    @compileLog(@typeOf(ptr));
    const ptr2 = ptr + 1;
    @compileLog(@typeOf(ptr2));
    const ptr3 = ptr + x;
    @compileLog(@typeOf(ptr3));
}

expected output:

| [*]align(2) u8
| [*]align(1) u8
| [*]align(1) u8

actual output:

| [*]align(2) u8
| [*]align(2) u8
| [*]align(2) u8

When we add a comptime known value to the pointer, we know what the new alignment should be.

When we add a runtime value to the pointer, it should make the type have alignment 1 no matter what, because the value could have made it unaligned.