5g, 8g: dead code (already removed from 6g)

R=ken2
CC=golang-dev
https://golang.org/cl/1983041

src/cmd/5g/ggen.c

@@ -733,7 +733,7 @@ getargs(NodeList *nn, Node *reg, int n)
 void
 cmpandthrow(Node *nl, Node *nr)
 {
-	vlong cl, cr;
+	vlong cl;
 	Prog *p1;
 	int op;
 	Node *c, n1, n2;
@@ -743,17 +743,8 @@ cmpandthrow(Node *nl, Node *nr)
 		cl = mpgetfix(nl->val.u.xval);
 		if(cl == 0)
 			return;
-		if(smallintconst(nr)) {
-			cr = mpgetfix(nr->val.u.xval);
-			if(cl > cr) {
-				if(throwpc == nil) {
-					throwpc = pc;
-					ginscall(panicslice, 0);
-				} else
-					patch(gbranch(AB, T), throwpc);
-			}
+		if(smallintconst(nr))
 			return;
-		}
 
 		// put the constant on the right
 		op = brrev(op);

src/cmd/8g/ggen.c

@@ -854,7 +854,7 @@ getargs(NodeList *nn, Node *reg, int n)
 void
 cmpandthrow(Node *nl, Node *nr)
 {
-	vlong cl, cr;
+	vlong cl;
 	Prog *p1;
 	int op;
 	Node *c;
@@ -864,18 +864,8 @@ cmpandthrow(Node *nl, Node *nr)
 		cl = mpgetfix(nl->val.u.xval);
 		if(cl == 0)
 			return;
-		if(smallintconst(nr)) {
-			cr = mpgetfix(nr->val.u.xval);
-			if(cl > cr) {
-				if(throwpc == nil) {
-					throwpc = pc;
-					ginscall(panicslice, 0);
-				} else
-					patch(gbranch(AJMP, T), throwpc);
-			}
+		if(smallintconst(nr))
 			return;
-		}
-
 		// put the constant on the right
 		op = brrev(op);
 		c = nl;