arm: fix build by disabling list copying optimization for 5g.

R=rsc
CC=golang-dev
https://golang.org/cl/1697053

src/cmd/gc/range.c

@@ -115,7 +115,9 @@ walkrange(Node *n)
 		v2 = n->list->next->n;
 	hv2 = N;
 
-	if(v2 == N && t->etype == TARRAY) {
+	// TODO(kaib): re-enable this optimization on arm once we are on par with 6g/8g
+	// see http://code.google.com/p/go/issues/detail?id=943
+	if(v2 == N && t->etype == TARRAY && thechar != '5') {
 		// will have just one reference to argument.
 		// no need to make a potentially expensive copy.
 		ha = a;

test/golden-arm.out

@@ -52,9 +52,9 @@ FAIL
 Hello World!
 
 =========== ken/cplx0.go
-(+1.066132e-308+1.313301e-308i)
+(+1.066132e-308+1.313303e-308i)
 (+1.066132e-308+1.066132e-308i)
-(+1.066132e-308+1.313301e-308i)
+(+1.066132e-308+1.313303e-308i)
 (+1.066132e-308+1.066132e-308i)
 
 =========== ken/cplx3.go