[trans-mem] RFC Fix missing REG_TM notes

[Patrick Marlier]

In trans-mem.c:make_tm_edge, it gets the slot for insertion but it 
doesn't set it. Fixing this makes cfgexpand.c: 
mark_transaction_restart_calls fails because sometimes the instruction 
is not found. In the attached patch, I just ignore if insn is NULL but 
do you have an idea why this happens?

On my side, I was able to fix the problem with genome but the patch is 
not clean at all and I need to find exactly where and why the problem 
was fixed.

Thanks!
--
Patrick Marlier.
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