* config/rs6000/rs6000.md (movsi): Constify 'name'.
* regclass.c [CLASS_CANNOT_CHANGE_SIZE]
(class_can_change_size): New variable.
(reg_changes_size): New variable.
(init_reg_sets_1): Initialise class_can_change_size.
(record_operand_costs): Remove subreg_changes_size.
Don't pass it around. Instead update reg_changes_size.
(regclass): Initialise and free reg_changes_size. If a register
changes size, don't preference it to a class that contains
registers that can't change size.
(record_reg_classes): Don't look at subreg_changes_size.
From-SVN: r34227
