YJIT: Add codegen for Array#<<

[k0kubun]

This codegen simply skips pushing a frame when calling Array#<<. The interpreter skips it on opt_ltlt, so it's fair to do the same thing on YJIT.

Note that we cannot use Primitive.attr! :leaf to implement this because BOP methods must be implemented in C at the moment.

Benchmark

I found this is useful for speeding up Optcarrot when I worked on RJIT. This doesn't speed up headline benchmarks, but this method should be fairly popular in actual real-world applications.

before: ruby 3.3.0dev (2023-04-03T15:59:05Z master ba4ff2552e) +YJIT [x86_64-linux]
after: ruby 3.3.0dev (2023-04-03T18:20:37Z yjit-array-push cbf04e0aad) +YJIT [x86_64-linux]

---------  -----------  ----------  ----------  ----------  ------------  -------------
bench      before (ms)  stddev (%)  after (ms)  stddev (%)  before/after  after 1st itr
optcarrot  1823.1       0.8         1757.6      0.7         1.04          1.05
---------  -----------  ----------  ----------  ----------  ------------  -------------

[maximecb]

Nice :)

[maximecb]

GitHub CI is broken for some reason. Seems unrelated to this PR.