fix missed script_compiled events. [Bug #15471]

	* ruby.c (process_options): script_compiled events are missed on
	  command line -e or specified file. this commit fix it.
	  [Bug #15471]

	  This patch should be backport to Ruby 2.6 branch.

	* vm_core.h (rb_exec_event_hook_script_compiled): introduce utility
	  function to invoke a script_compiled event.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@66815 b2dd03c8-39d4-4d8f-98ff-823fe69b080e