New compiler: [Platform] std.Thread.spawn -> unreachable -> segfault

[scottc]

x86_64 linux

New roc compiler

Commit: 719fcae1151c0f1ecd30894366cbe4c9e2f99397

Adding a std.Thread.spawn call...

fn hostedStdoutLine(ops: *builtins.host_abi.RocOps, ret_ptr: *anyopaque, args_ptr: *anyopaque) callconv(.c) void {
    _ = ops;
    _ = ret_ptr;
    _ = args_ptr;

    // ...

    const thread_test = struct {
        fn worker() void {
            std.Thread.sleep(1 * std.time.ns_per_s);
        }
    };

    _ = std.Thread.spawn(.{}, thread_test.worker, .{}) catch {};

    // ...
}

Result: thread 54669 panic: reached unreachable code

[anon@nixos:~/Projects/roc]$ zig build test
[...tests fail...]

[anon@nixos:~/Projects/roc]$ ./zig-out/bin/roc ./test/fx/app.roc
thread 54669 panic: reached unreachable code
error: Child process /home/anon/.cache/roc/75fed07d9047282a9e6197f23853ba39/temp/roc-tmp-RmsPvqoZLOh3Y7e4JvbGzW1HSRiQC1uu/roc_run_3344319531 killed by signal: 11
error: Child process crashed with segmentation fault (SIGSEGV)

Then program exits, without continuing.