[middle-end] Add machine_mode to address_cost target hook

[nick clifton]

Hi Oleg,

> And so I did.  Attached is an updated patch that adds the address space
> parameter to the address_cost function.  I hope that this change does
> not reset the ACKs so far:
>
> [x] target-independent bits
> [ ] alpha     [ ] arm       [ ] avr         [ ] bfin
> [ ] cr16      [ ] cris      [ ] epiphany    [ ] i386
> [ ] ia64      [ ] iq2000    [ ] lm32        [ ] m32c
> [ ] m32r      [ ] mcore     [ ] mep         [x] microblaze
> [x] mips      [ ] mmix      [x] mn10300     [ ] pa
> [ ] rs6000    [ ] rx        [ ] s390        [ ] score
> [x] sh        [ ] sparc     [ ] spu         [ ] stormy16
> [ ] v850      [ ] vax       [ ] xtensa

Please add ACKs for: iq2000, m32r, mcore, rx, stormy16 and v850.

Cheers
   Nick