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pc64: dont dump registers for user process on pagefault error, was experiment

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

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

@@ -655,8 +655,8 @@

 	up->insyscall = 1;

 	n = fault(addr, read);

 	if(n < 0){

-		dumpregs(ureg);

 		if(!user){

+			dumpregs(ureg);

 			panic("fault: %#p", addr);

 		}

 		checkpages();