Revert "encoding/asn1: fix unmarshalling SEQUENCE OF SET"

This reverts CL 160819 (commit 4692343c)

Reason for revert: causing lots of failures on master

Change-Id: I96fd39ae80fe350ba8b3aa310443d41daec38093
Reviewed-on: https://go-review.googlesource.com/c/go/+/206146Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/encoding/asn1/asn1_test.go

@@ -1129,22 +1129,3 @@ func TestBMPString(t *testing.T) {
 		}
 	}
 }
-
-func TestSequenceOfSet(t *testing.T) {
-	type someSetSET struct {
-		A int `asn1:"tag:0"`
-	}
-
-	type someStruct struct {
-		B int          `asn1:"tag:0"`
-		C []someSetSET `asn1:"tag:1"`
-	}
-
-	der := []byte{0x30, 0x0F, 0x80, 0x01, 0x01, 0xA1, 0x0A, 0x31, 0x03, 0x80, 0x01, 0x01, 0x31, 0x03, 0x80, 0x01, 0x02}
-
-	var b someStruct
-	if _, err := Unmarshal(der, &b); err != nil {
-		t.Errorf("Unmarshal failed: %v", err)
-	}
-
-}

src/encoding/asn1/common.go

@@ -167,9 +167,6 @@ func getUniversalType(t reflect.Type) (matchAny bool, tagNumber int, isCompound,
 	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
 		return false, TagInteger, false, true
 	case reflect.Struct:
-		if strings.HasSuffix(t.Name(), "SET") {
-			return false, TagSet, true, true
-		}
 		return false, TagSequence, true, true
 	case reflect.Slice:
 		if t.Elem().Kind() == reflect.Uint8 {