Thanks to Martin we now have a test that exercises (cp) cloning
machinery during the WPA stage of LTO.

Also, during debugging I found that print_all_lattices would trigger
an assert if I tried to call it inside decide_whether_version_node.

Finally I've attached some comment spelling fixes as a bonus.


Bootstrapping (--with-build-config=bootstrap-lto) and regression testing on x86_64.

Ok for trunk after tests pass?


- Michael