(init_regset_vector): Make global; don't take basic block times # of pseduos
as argument.
(life_analysis): Change all init_regset_vector calls.
Use free_regset_vector to release arrays only flow uses at end.
(allocate_for_life_analysis): Change init_regset_vector call.
Don't set regset_{size,bytes}.
(free_regset_vector): Call FREE_REG_SET to release any memory allocated
by each vector.
(propagate_block): Call FREE_REG_SET on dead/live.
(mark_used_regs): Don't use REGSET_ELT_TYPE anymore.

From-SVN: r14422