This adds TIF_MEMDIE for FRV. 

Could whoever added it to include/asm-i386/thread_info.h comment this flag
there please? I've given it a comment here, but I'm not sure it's correct.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>