Passing &slice[0] as argument causes compiler assert when payload is zero sized

[SpexGuy]

// repro.zig
pub fn destroy(ptr: *void) void {}

test "" {
    var slice: []void = undefined;
    destroy(&slice[0]);
}

> zig version
0.6.0+0088efc4b
> zig test repro.zig
Assertion failed at D:\a\1\s\src\stage1\codegen.cpp:3933 in ir_render_elem_ptr. This is a bug in the Zig compiler.
Unable to dump stack trace: debug info stripped