YJIT: Prefer an overloaded cme if available

[k0kubun]

This PR adds support for overloaded cme. It allows Array#first and Array#last to be considered leaf.

Since #5112, ISEQs can be overloaded. Array#first and Array#last are one of such examples (#7486), and they are leaf only in the overloaded version.

It speeds up rubykon by 3%, which calls Array#first fairly frequently:

before: ruby 3.4.0dev (2024-02-10T00:23:17Z master ea91ab696e) +YJIT [x86_64-linux]
after: ruby 3.4.0dev (2024-02-10T01:13:04Z yjit-mandatory dae393743e) +YJIT [x86_64-linux]

-------  -----------  ----------  ----------  ----------  -------------  ------------
bench    before (ms)  stddev (%)  after (ms)  stddev (%)  after 1st itr  before/after
rubykon  8022.2       1.2         7818.6      1.0         1.02           1.03
-------  -----------  ----------  ----------  ----------  -------------  ------------