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pc64: print only 8 hex chars dumpstack sp/pc

kernel addresses are sign extended to 64 bit. upper bits
are not really helpfull.

--- a/sys/src/9/pc64/trap.c

+++ b/sys/src/9/pc64/trap.c

@@ -571,7 +571,7 @@

 			 * (((uchar*)v)[-2] == 0xFF && ((uchar*)v)[-2] == 0xD0),

 			 * but this is too clever and misses faulting address.

 			 */

-			x += iprint("%.8p=%.8p ", l, v);

+			x += iprint("%.8lux=%.8lux ", (ulong)l, (ulong)v);

 			i++;

 		}

 		if(i == 4){