[Feature #2328] malloc_limit の肥大化を防ぎたい

e$B%A%1%C%He(B #2328 e$B$,99?7$5$l$^$7$?!#e(B (by _ wanabe)

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e$BBgJQ?=$7$o$1$J$$$N$G$9$,e(B Reject
e$B07$$$K$7$F$$$?$@$1$J$$$G$7$g$&$+!#e(B

http://redmine.ruby-lang.org/issues/show/2328