cmd/compile,runtime: pass elem type to {make,grow}slice

No point in passing the slice type to these functions.
All they need is the element type.  One less indirection,
maybe a few less []T type descriptors in the binary.

Change-Id: Ib0b83b5f14ca21d995ecc199ce8ac00c4eb375e6
Reviewed-on: https://go-review.googlesource.com/22275
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
diff --git a/src/cmd/compile/internal/gc/walk.go b/src/cmd/compile/internal/gc/walk.go
index e4d9333..82ac74a 100644
--- a/src/cmd/compile/internal/gc/walk.go
+++ b/src/cmd/compile/internal/gc/walk.go
@@ -1420,11 +1420,11 @@
 			r = walkexpr(r, init)
 			n = r
 		} else {
-			// makeslice(t *Type, nel int64, max int64) (ary []any)
+			// makeslice(et *Type, nel int64, max int64) (ary []any)
 			fn := syslook("makeslice")
 
 			fn = substArgTypes(fn, t.Elem()) // any-1
-			n = mkcall1(fn, n.Type, init, typename(n.Type), conv(l, Types[TINT64]), conv(r, Types[TINT64]))
+			n = mkcall1(fn, n.Type, init, typename(t.Elem()), conv(l, Types[TINT64]), conv(r, Types[TINT64]))
 		}
 
 	case ORUNESTR:
@@ -2799,7 +2799,7 @@
 	fn = substArgTypes(fn, s.Type.Elem(), s.Type.Elem())
 
 	// s = growslice(T, s, n)
-	nif.Nbody.Set1(Nod(OAS, s, mkcall1(fn, s.Type, &nif.Ninit, typename(s.Type), s, nn)))
+	nif.Nbody.Set1(Nod(OAS, s, mkcall1(fn, s.Type, &nif.Ninit, typename(s.Type.Elem()), s, nn)))
 	l = append(l, nif)
 
 	// s = s[:n]
@@ -2929,7 +2929,7 @@
 	fn = substArgTypes(fn, ns.Type.Elem(), ns.Type.Elem())
 
 	nx.Nbody.Set1(Nod(OAS, ns,
-		mkcall1(fn, ns.Type, &nx.Ninit, typename(ns.Type), ns,
+		mkcall1(fn, ns.Type, &nx.Ninit, typename(ns.Type.Elem()), ns,
 			Nod(OADD, Nod(OLEN, ns, nil), na))))
 
 	l = append(l, nx)