[Bug #3271] BigMath.power が遅い

Bug #3271: BigMath.power e$B$,CY$$e(B
http://redmine.ruby-lang.org/issues/show/3271

e$B5/I<<Te(B: Kenta M.
e$B%9%F!<%?%9e(B: Open, e$BM%@hEYe(B: Normal
e$BC4Ev<Te(B: Kenta M., e$B%+%F%4%je(B: lib, Target version: 1.9.x
ruby -v: ruby 1.9.3dev (2010-05-11 trunk 27729) [x86_64-darwin10.3.0]

Rubye$B$K$D$$$Fe(B Part 40
http://pc12.2ch.net/test/read.cgi/tech/1272248179/121-122