[head tinderbox] failure on sparc64/sun4v

[Joseph Koshy]

> /src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_mod.c: In function 'pmc_process_interrupt':
> /src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_mod.c:3825: warning: implicit declaration of function 'PMC_TRAPFRAME_TO_PC'
> /src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_mod.c:3825: warning: nested extern declaration of 'PMC_TRAPFRAME_TO_PC'
> *** Error code 1

Oops.  These build failures should be fixed now, sorry about that!

-- 
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