varpool.c (dump_varpool_node): Dump used_by_single_function.
* varpool.c (dump_varpool_node): Dump used_by_single_function.
* tree-pass.h (make_pass_ipa_single_use): New pass.
* cgraph.h (used_by_single_function): New flag.
* lto-cgraph.c (lto_output_varpool_node, input_varpool_node): Stream
it.
* passes.def (pass_ipa_single_use): Scedule.
* ipa.c (BOTTOM): New macro.
(meet): New function
(propagate_single_user): New function.
(ipa_single_use): New function.
(pass_data_ipa_single_use): New pass.
(pass_ipa_single_use): New pass.
(pass_ipa_single_use::gate): New gate.
(make_pass_ipa_single_use): New function.
From-SVN: r211925