gc: final ...T bug for the day

R=ken2
CC=golang-dev
https://golang.org/cl/199046

src/cmd/gc/gen.c

@@ -411,6 +411,8 @@ cgen_dcl(Node *n)
 	}
 	if(!(n->class & PHEAP))
 		return;
+	if(n->alloc == nil)
+		n->alloc = callnew(n->type);
 	cgen_as(n->heapaddr, n->alloc);
 }
 

src/cmd/gc/typecheck.c

@@ -1907,7 +1907,6 @@ addrescapes(Node *n)
 			n->class |= PHEAP;
 			n->addable = 0;
 			n->ullman = 2;
-			n->alloc = callnew(n->type);
 			n->xoffset = 0;
 
 			// create stack variable to hold pointer to heap

src/cmd/gc/walk.c

@@ -2182,6 +2182,8 @@ paramstoheap(Type **argin)
 			continue;
 
 		// generate allocation & copying code
+		if(v->alloc == nil)
+			v->alloc = callnew(v->type);
 		nn = list(nn, nod(OAS, v->heapaddr, v->alloc));
 		nn = list(nn, nod(OAS, v, v->stackparam));
 	}

test/ddd.go

@@ -18,13 +18,11 @@ func sumC(args ...int) int {
 	return func() int { return sum(args) } ()
 }
 
-/* TODO(rsc)
 var sumD = func(args ...int) int { return sum(args) }
 
 var sumE = func() func(...int) int { return func(args ...int) int { return sum(args) } } ()
 
 var sumF = func(args ...int) func() int { return func() int { return sum(args) } }
-*/
 
 func sumA(args []int) int {
 	s := 0
@@ -76,7 +74,6 @@ func main() {
 	if x := sumC(4, 5, 6); x != 15 {
 		panicln("sumC 15", x)
 	}
-/* TODO(rsc)
 	if x := sumD(4, 5, 7); x != 16 {
 		panicln("sumD 16", x)
 	}
@@ -86,7 +83,6 @@ func main() {
 	if x := sumF(4, 5, 9)(); x != 18 {
 		panicln("sumF 18", x)
 	}
-*/
 	if x := sum2(1, 2, 3); x != 2*6 {
 		panicln("sum 6", x)
 	}