[ruby-cvs:69574] usa:r62393 (trunk): revert r62392

[usa at ruby-lang.org]

usa	2018-02-13 18:34:37 +0900 (Tue, 13 Feb 2018)

  New Revision: 62393

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=62393

  Log:
    revert r62392
    
    check the declaration of `rb_autoloading_value()` in vm_core.h and the call in
    vm_insnhelper.c, and retry it.

  Modified files:
    trunk/test/ruby/test_autoload.rb
    trunk/variable.c