This patch fixes intransitive comparison in reload_pseudo_compare_func. 
Imagine the following
situation:
1) bitmap_bit_p is unset for A and B but set for C
2) A < B (due to early ira_reg_class_max_nregs comparison)
3) B < C (due to following regno_assign_info comparison)

It may then easily happen that A > C (due to regno_assign_info 
comparison) which violates the transitiveness requirement of total ordering.

Unfortunately I'm not sure how to properly fix this so Cc-ing Vladimir 
for help.

/Yury