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This PR makes loading IRB lazy. It improves startup time.
Problem
Byebug always loads IRB, but IRB is necessary only for
irb
command. It makes startup time slower unnecessarily for non-IRB users.Solution
Let's load IRB lazily.
Benchmark
About 55ms (50%) faster.
before
$ RUBYLIB=lib ruby -rbenchmark -e 'p Benchmark.realtime{require "byebug/core"};' 0.11415267689153552
after
$ RUBYLIB=lib ruby -rbenchmark -e 'p Benchmark.realtime{require "byebug/core"};' 0.059115791926160455