reflect: correctly handle direct interface typed receiver in Value.call

A direct interface type's value method takes value receiver now.
    Don't pass pointer to the method function.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/175798

From-SVN: r271000

gcc/go/gofrontend/MERGE

@@ -1,4 +1,4 @@
-e3ba8828baf60343316bb68002e94570ee63ad1e
+fcbf847c3bf76fb475c9020e1c57057134407263
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/go/reflect/value.go

@@ -401,7 +401,7 @@ func (v Value) call(op string, in []Value) []Value {
 	if v.flag&flagMethod != 0 {
 		nin++
 	}
-	firstPointer := len(in) > 0 && t.In(0).Kind() != Ptr && v.flag&flagMethodFn != 0
+	firstPointer := len(in) > 0 && ifaceIndir(t.In(0).common()) && v.flag&flagMethodFn != 0
 	params := make([]unsafe.Pointer, nin)
 	off := 0
 	if v.flag&flagMethod != 0 {