[Backport #1656](Closed) fdiv $B$N;HMQ$G(B Segmentation fault $B$,H/@8$9$k(B

[Shyouhei_U]

e$B%A%1%C%He(B #1656 e$B$,99?7$5$l$^$7$?!#e(B (by Shyouhei U.)

e$B%9%F!<%?%9e(B Assignede$B$+$ie(BClosede$B$KJQ99e(B

Applied in changeset r24313.

http://redmine.ruby-lang.org/issues/show/1656