[patch] fix TM clone drops at LTO time

[Aldy Hernandez]

While working on PR51698, I've noticed the LTO/TM rabbit hole goes much 
deeper.

The compiler is dropping transactional clones with -flto because the 
externally_visible bit is unset for clones.  This is so because 
cgraph_copy_node_for_versioning unconditionally zaps it.  I have fixed 
the TM infrastructure to set the bit on the clones if the original 
version had it set.

This patch will be needed to get PR51698 and LTO working with TM.

OK?

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