fix stacks for amd64.

note that do to the design of itoa(), we don't have to specify %llx.
the size of the type is inferred.  there will be a seperate patch to fix
a problem with \a or \A and itoa.

Reference: /n/atom/patch/applied/acidthread64
Date: Wed Feb 19 01:53:39 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/lib/acid/thread	Wed Feb 19 01:51:56 2014
+++ /sys/lib/acid/thread	Wed Feb 19 01:51:57 2014
@@ -2,7 +2,7 @@
 
 defn labpc(l)
 {
-	if objtype == "386" then
+	if objtype == "386" || objtype == "amd64" then
 		return longjmp;
 	return *(l+4);
 }
@@ -27,7 +27,7 @@
 	complex Alt A;
 
 	s = "alt(";
-	s = s + "tag(*" + itoa(A.tag, "%x") + "=" + itoa(*A.tag, "%x") + ") ";
+	s = s + "tag(*" + itoa(A.tag\W, "%x") + "=" + itoa(*(A.tag\W), "%x") + ") ";
 	i = 0;
 	yes = 0;
 	while A.op != CHANEND && A.op != CHANNOBLK do{
@@ -74,7 +74,7 @@
 	}
 	if a == {} then
 		return "{}";
-	return itoa(a\X, "%x");
+	return itoa(a\W, "%x");
 }
 
 stkignorelist = {};
@@ -351,7 +351,7 @@
 			if C.e==4 then {
 				print((*p)\X, " ");
 			}else {
-				print("data(", (*p)\X, ") ");
+				print("data(", (*p)\W, ") ");
 			}
 			p = p+C.e;
 			if p == C.v+C.s*C.e then {