[Bug libitm/51855] improve calculation of stack bottom in libitm's undolog

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51855

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-01-13 
23:41:44 UTC ---
Hmm, do you know if this works with a split stack?