Speculative fix for computing Math.pow(2, -1074) on win32 where the overloaded pow(double, int) function from math.h produces the wrong answer. 
Speculative fix for computing Math.pow(2, -1074) on win32 where
the overloaded pow(double, int) function from math.h produces the
wrong answer. 

TBR=whesse@chromium.org
Review URL: http://codereview.chromium.org/131022

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@2214 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh