'Bootstrap' with promote statics

This commit manages to get promote statics to work so that stage3
compiler works, but it fails because of symbol randomization. To achive
this, we had to disable the ipa-sra optimization, as it was generating
incorrect code.

gcc/ChangeLog:
2020-07-07  Giuliano Belinassi  <giuliano.belinassi@usp.br>

	* cgraphunit.c (ipa_passes): Quick switch between promote statics
	and balance.
	* ipa-sra.c (gate): Disable it for split_outputs.
	* ipa.c (remove_unreachable_nodes): Force output vnodes are
	obviously needed.
	* lto-cgraph.c (lto_apply_partition_mask): use aux2 instead of aux,
	and mark nodes in the boundary to not be removed.
	* lto-partition.c (merge_comdat_nodes): Handle references.
	(balance_partitions): Avoid generating several small partitions.
	(merge_contained_symbols): New function.
	(lto_merge_comdat_map): Handle contained symbols.
	(lto_promote_cross_file_statics): Set promoted nodes to be
	non-local.
	* tree.c (filter_name): New function.
	(get_file_function_name): Filter buf so that it do not confuse ld.

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