[Bug libitm/57855] passing unsafe function as transaction_safe function pointer does not generate error

[spear at cse dot lehigh.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57855

--- Comment #1 from Mike Spear <spear at cse dot lehigh.edu> ---
PS: error seems to have been around for a while, and is certainly present in
trunk revision 200806