[Bug middle-end/50251] [4.7 Regression] Revision 178353 caused many test failures

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50251

--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> 2011-09-01 19:32:54 
UTC ---
alloca is special with stack alignment. We may need to take
the new change into account.