miscompilation when writing through pointer to optional slice arg

[andrewrk]

zig version: 0.11.0-dev.1844+75ff34db9

const std = @import("std");
const testing = std.testing;

test "write through pointer to optional slice arg" {
    var foo: ?[]const u8 = null;
    try bar(&foo);
    try testing.expectEqualStrings(foo.?, "ok");
}

fn bar(foo: *?[]const u8) !void {
    foo.* = try baz();
}

fn baz() ![]const u8 {
    return "ok";
}

$ stage4/bin/zig test test.zig 
LLVM Emit Object... zig: /home/andy/Downloads/llvm-project-15/llvm/include/llvm/Support/Casting.h:578: decltype(auto) llvm::cast(From*) [with To = llvm::ValueAsMetadata; From = const llvm::Metadata]: Assertion `isa<To>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
Aborted (core dumped)

In this example it triggers an LLVM assertion. In the actual usage that I have, it is a silent miscompilation that leaves foo incorrectly null.

[jacobly0]

Very likely duplicate of #14715.