Revert "Omit irb related examples temporary"

This reverts commit 750e619.

Author: hsbt

spec/bundler/commands/console_spec.rb

@@ -2,12 +2,6 @@
 
 RSpec.describe "bundle console", readline: true do
   before :each do
-    begin
-      require "irb"
-    rescue LoadError
-      skip "This spec requires IRB to be available"
-    end
-
     build_repo2 do
       # A minimal fake pry console
       build_gem "pry" do |s|

spec/bundler/commands/platform_spec.rb

@@ -950,12 +950,6 @@ def should_be_patchlevel_fixnum
     end
 
     it "starts IRB with the default group loaded when ruby version matches", :readline do
-      begin
-        require "irb"
-      rescue LoadError
-        skip "This spec requires IRB to be available"
-      end
-
       gemfile <<-G
         source "https://gem.repo1"
         gem "myrack"