Technically we shouldn't see Qfalse now, but RTEST also compiles down to
just one branch anyways. Pretty contrived issue, but easy to fix.

* Optimize Marshal dump of large fixnum

Marshal's FIXNUM type only supports 31-bit fixnums, so on 64-bit
platforms the 63-bit fixnums need to be represented in Marshal's
BIGNUM.

Previously this was done by converting to a bugnum and serializing the
bignum object.

This commit avoids allocating the intermediate bignum object, instead
outputting the T_FIXNUM directly to a Marshal bignum. This maintains the
same representation as the previous implementation, including not using
LINKs for these large fixnums (an artifact of the previous
implementation always allocating a new BIGNUM).

This commit also avoids unnecessary st_lookups on immediate values,
which we know will not be in that table.

* Fastpath for loading FIXNUM from Marshal bignum

* Run update-deps

http://rubyci.s3.amazonaws.com/centos7/ruby-master/log/20211025T093004Z.log.html.gz
```
/home/chkbuild/chkbuild/tmp/build/20211025T093004Z/ruby/test/ruby/test_marshal.rb:925: warning: assigned but unused variable - objects
```

Fixes [Feature #18148]

When set, all the loaded objects are returned as frozen.

If a proc is provided, it is called with the objects already frozen.

For cyclic objects, it requires to keep a st_table of the partially
initialized objects.