Don't give PageAllocationAligned the option to allocate executable memory
https://bugs.webkit.org/show_bug.cgi?id=111657

Reviewed by Geoffrey Garen.

* wtf/PageAllocationAligned.cpp:
(WTF::PageAllocationAligned::allocate):
* wtf/PageAllocationAligned.h:
(PageAllocationAligned):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145018 268f45cc-cd09-0410-ab3c-d52691b4dbfc