* lto-partition.c (new_partition): Reset number of symbols.
	(add_symbol_to_partition_1): Increment number of symbols.
	(undo_partition): Decrement number of symbols.
	(lto_balanced_map): Dump number of symbols and insns that
	belong to a partition.
	* lto-partition.h (struct ltrans_partition_def): Add symbol counter.

From-SVN: r223750