[PATCH] PR libstdc++/91620 Implement DR 526 for std::[forward_]list::remove_if/unique

[François Dumont]

Here is the patch to extend DR 526 to forward_list and list remove_if 
and unique.

As the adopted pattern is simpler I also applied it to the remove methods.

 Â Â Â  PR libstdc++/91620
 Â Â Â  * include/bits/forward_list.tcc (forward_list<>::remove): Collect nodes
 Â Â Â  to destroy in an intermediate forward_list.
 Â Â Â  (forward_list<>::remove_if, forward_list<>::unique): Likewise.
 Â Â Â  * include/bits/list.tcc (list<>::remove, list<>::unique): Likewise.
 Â Â Â  (list<>::remove_if): Likewise.
 Â Â Â  * include/debug/forward_list (forward_list<>::_M_erase_after): Remove.
 Â Â Â  (forward_list<>::erase_after): Adapt.
 Â Â Â  (forward_list<>::remove, forward_list<>::remove_if): Collect nodes to
 Â Â Â  destroy in an intermediate forward_list.
 Â Â Â  (forward_list<>::unique): Likewise.
 Â Â Â  * include/debug/list (list<>::remove, list<>::unique): Likewise.
 Â Â Â  (list<>::remove_if): Likewise.

Tested under Linux x86_64 normal and debug modes.

Ok to commit ?

François

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