because it's actually setting fastpath to cc instead of ci since r51903.

vm_insnhelper.c: ditto
mjit_compile.c: ditto
tool/ruby_vm/views/_mjit_compile_send.erb: ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64772 b2dd03c8-39d4-4d8f-98ff-823fe69b080e