[ruby/json] Apply RB_UNLIKELY for less frequently used options
This speeds up JSON.generate by about 4% in a benchmark.
JSON.generate
https://github.com/ruby/json/commit/6471710cfc
[ruby/json] Apply RB_UNLIKELY for less frequently used options
This speeds up
JSON.generateby about 4% in a benchmark.https://github.com/ruby/json/commit/6471710cfc