* params.def (MAX_PARTITION_SIZE): New param.
* invoke.texi: Document lto-max-partition.
lto/
* lto-partition.h (lto_balanced_map): New parameter.
* lto-partition.c (lto_balanced_map): New parameter
max_partition_size.
Check if partition size is greater than max_partition_size.
* lto.c (do_whole_program_analysis): Adjust calls to
lto_balanced_map() to pass 2nd argument.