* lto.c: Include params.h.
(add_cgraph_node_to_partition, add_varpool_node_to_partition): Do
refcounting in aux field.
(undo_partition, partition_cgraph_node_p, partition_varpool_node_p):
New functions.
(lto_1_to_1_map): Simplify.
(lto_balanced_map): New function.
(do_whole_program_analysis): Chose proper partitioning alg.
* Make-lang.in (lto.o): Add dependency on params.h