stage2: miscompilation w/ pointers to zero sized types

[ethernetsellout]

Zig Version

0.10.0-dev.4711+2b25d3c33

Steps to Reproduce and Observed Behavior

run this code:

const std = @import("std");

const A = struct {
    b: void = {},
    u: u8
};

pub fn main() !void {
    var a = A { .u = 0 };
    const a_ptr = @fieldParentPtr(A, "b", &a.b);
    try std.testing.expectEqual(&a, a_ptr);
}

output:
expected ab.A@5a405ffca8, found ab.A@5a405ffca9

Expected Behavior

per #6706 I would expect a_ptr to point to a.