Nested literals with runtime slices causing weird compiler crashes

[fengb]

This starts manifesting with struct literals 2 levels deep. This only seems to happen with runtime slices.

pub fn main() void {
    die("");
}

fn die(slice: []const u8) void {
    const working = .{
        .bar = slice,
        .baz = "",
    };

    const broken = .{
        .foo = .{
            .bar = slice,
            .baz = "", // this line creates a runtime bus error
        },
    };

    const really_broken = .{
        .foo = .{
            .bar = slice,
            .baz = .{}, // the compiler seg faults when having a third nested level
        },
    };
}

[fengb]

Possibly caused by the same issue as #6043

[ghost]

Here's another similar looking one: #3915

[fengb]

Dupe of #7627