Arch agnostic completely out of line locks

This patch achieves out of line spinlocks by creating kernel/spinlock.c
and using the _raw_* inline locking functions. Now, as much as this is
supposed to be arch agnostic, there was still a fair amount of rummaging
about in archs, mostly for the cases where the arch already has out of
line locks and i wanted to avoid the extra call, saving that extra call
also makes lock profiling easier. PPC32/64 was an example of such an arch
and i have added the necessary profile_pc() function as an example.

Size differences are with CONFIG_PREEMPT enabled since we wanted to
determine how much could be saved by moving that lot out of line too.

ppc64 = 259897 bytes:
   text    data     bss     dec     hex filename
5489808 1962724  709064 8161596  7c893c vmlinux-after
5749577 1962852  709064 8421493  808075 vmlinux-before

sparc64 = 193368 bytes:
  text    data     bss     dec     hex filename
3472037  633712  308920 4414669  435ccd vmlinux-after
3665285  633832  308920 4608037  465025 vmlinux-before

i386 = 524115 bytes
   text    data     bss     dec     hex filename
5695619  870906  328112 6894637  69342d vmlinux-after
6221254  870634  326864 7418752  713380 vmlinux-before

x86-64 = 282446 bytes
   text    data     bss     dec     hex filename
4598025 1450644  523632 6572301  64490d vmlinux-after
4881679 1449436  523632 6854747  68985b vmlinux-before

It has been compile tested (UP, SMP, PREEMPT) on i386, x86-64, sparc,
sparc64, ppc64, ppc32 and runtime tested on i386 and x86-64. I still have
to get benchmarks done (most probably i386). The patch is currently
against 2.6.9-rc1-mm1 because we'd have to back out the i386/x86_64 out of
line lock patches since this does it in a different way, i can merge later
on.

Thanks,
	Zwane
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