Make the diff between the traps_32.c and traps_64.c a bit smaller.

Change traps_32.c to look more like traps_64.c:
 - move lock information to file scope
 - split out oops_begin() and oops_end() from die()
 - increment nest counter in oops_begin

Only whitespace change in traps_64.c

No functional changes intended.
Signed-off-by: NAlexander van Heukelum <heukelum@fastmail.fm>
Acked-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>