cmd/compile: map TSLICE to obj.KindSlice directly

Change-Id: Idab5f603c1743895b8f4edbcc55f7be83419a099
Reviewed-on: https://go-review.googlesource.com/22383
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>

src/cmd/compile/internal/gc/reflect.go

@@ -686,7 +686,7 @@ var kinds = []int{
 	TCHAN:       obj.KindChan,
 	TMAP:        obj.KindMap,
 	TARRAY:      obj.KindArray,
-	TSLICE:      obj.KindArray,
+	TSLICE:      obj.KindSlice,
 	TFUNC:       obj.KindFunc,
 	TCOMPLEX64:  obj.KindComplex64,
 	TCOMPLEX128: obj.KindComplex128,
@@ -887,9 +887,6 @@ func dcommontype(s *Sym, ot int, t *Type) int {
 	ot = duint8(s, ot, t.Align) // fieldAlign
 
 	i = kinds[t.Etype]
-	if t.IsSlice() {
-		i = obj.KindSlice
-	}
 	if !haspointers(t) {
 		i |= obj.KindNoPointers
 	}