use reference trace to provide better build-on-save source locations for errors

[Techatrix]

Example:

const std = @import("std");

pub fn main() !void {
    std.log.info("{}", .{""});
}

Output:

$ zig run foo.zig -freference-trace=12
/nix/store/li7vdsrycv9zgp0phkxgsgn9fayn7cx0-zig-0.14.0-dev.1371+5723fcaac/lib/std/fmt.zig:663:17: error: cannot format array without a specifier (i.e. {s} or {any})
                @compileError("cannot format array without a specifier (i.e. {s} or {any})");
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
referenced by:
    formatType__anon_9361: /nix/store/li7vdsrycv9zgp0phkxgsgn9fayn7cx0-zig-0.14.0-dev.1371+5723fcaac/lib/std/fmt.zig:627:38
    format__anon_6673: /nix/store/li7vdsrycv9zgp0phkxgsgn9fayn7cx0-zig-0.14.0-dev.1371+5723fcaac/lib/std/fmt.zig:188:23
    print__anon_3923: /nix/store/li7vdsrycv9zgp0phkxgsgn9fayn7cx0-zig-0.14.0-dev.1371+5723fcaac/lib/std/io/Writer.zig:24:26
    defaultLog__anon_2963: /nix/store/li7vdsrycv9zgp0phkxgsgn9fayn7cx0-zig-0.14.0-dev.1371+5723fcaac/lib/std/io.zig:324:47
    log__anon_2562: /nix/store/li7vdsrycv9zgp0phkxgsgn9fayn7cx0-zig-0.14.0-dev.1371+5723fcaac/lib/std/log.zig:125:22
    info__anon_1614: /nix/store/li7vdsrycv9zgp0phkxgsgn9fayn7cx0-zig-0.14.0-dev.1371+5723fcaac/lib/std/log.zig:194:16
    main: foo.zig:4:17
    posixCallMainAndExit: /nix/store/li7vdsrycv9zgp0phkxgsgn9fayn7cx0-zig-0.14.0-dev.1371+5723fcaac/lib/std/start.zig:615:37
    _start: /nix/store/li7vdsrycv9zgp0phkxgsgn9fayn7cx0-zig-0.14.0-dev.1371+5723fcaac/lib/std/start.zig:422:40
    comptime: /nix/store/li7vdsrycv9zgp0phkxgsgn9fayn7cx0-zig-0.14.0-dev.1371+5723fcaac/lib/std/start.zig:92:63
    start: /nix/store/li7vdsrycv9zgp0phkxgsgn9fayn7cx0-zig-0.14.0-dev.1371+5723fcaac/lib/std/std.zig:101:27
    comptime: /nix/store/li7vdsrycv9zgp0phkxgsgn9fayn7cx0-zig-0.14.0-dev.1371+5723fcaac/lib/std/std.zig:160:9

This means that the error is reported in fmt.zig:663:17 instead of foo.zig:4:17. The reference trace could be used to figure out how the error was reached and report it at the callsite.