* parse.y (rb_gc_mark_symbols): set global_symbols.minor_marked only
  when full_mark is 0.
  rb_gc_mark_symbols() (with full_mark == 1) can be called by other
  than GC (such as rb_objspace_reachable_objects_from_root()).



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43734 b2dd03c8-39d4-4d8f-98ff-823fe69b080e