symbol.c: remove rb_gc_mark_symbols(). fstrings refered by static symbols and pinned dynamic symbols are registerd by rb_gc_register_mark_object(). frstring refered by dynamic symbols (not pinned symbols) are refered from global_symbols.dsymbol_fstr_hash (Hash object). Note that fstrings refered from dynamic symbols must live loger than symbol objects themselves because rb_gc_free_dsymbol() uses fstring to remove from symbol tables. This is why we can not mark fstrings from dynamic symbols. This technique reduces root objects for GC marking.
Added by ko1 (Koichi Sasada) over 11 years ago
fstrings refered by static symbols and pinned dynamic symbols
are registerd by rb_gc_register_mark_object().
frstring refered by dynamic symbols (not pinned symbols)
are refered from global_symbols.dsymbol_fstr_hash (Hash object).
Note that fstrings refered from dynamic symbols must live loger
than symbol objects themselves because rb_gc_free_dsymbol() uses
fstring to remove from symbol tables.
This is why we can not mark fstrings from dynamic symbols.
This technique reduces root objects for GC marking.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46772 b2dd03c8-39d4-4d8f-98ff-823fe69b080e