Labels: move Builder and Reset out of common

New internstrings implementation is different.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

model/labels/labels.go

@@ -371,6 +371,25 @@ func (ls Labels) ReleaseStrings(release func(string)) {
 	}
 }
 
+// Builder allows modifying Labels.
+type Builder struct {
+	base Labels
+	del  []string
+	add  []Label
+}
+
+// Reset clears all current state for the builder.
+func (b *Builder) Reset(base Labels) {
+	b.base = base
+	b.del = b.del[:0]
+	b.add = b.add[:0]
+	b.base.Range(func(l Label) {
+		if l.Value == "" {
+			b.del = append(b.del, l.Name)
+		}
+	})
+}
+
 // Labels returns the labels from the builder.
 // If no modifications were made, the original labels are returned.
 func (b *Builder) Labels() Labels {

model/labels/labels_common.go

@@ -123,13 +123,6 @@ func FromMap(m map[string]string) Labels {
 	return New(l...)
 }
 
-// Builder allows modifying Labels.
-type Builder struct {
-	base Labels
-	del  []string
-	add  []Label
-}
-
 // NewBuilder returns a new LabelsBuilder.
 func NewBuilder(base Labels) *Builder {
 	b := &Builder{
@@ -140,18 +133,6 @@ func NewBuilder(base Labels) *Builder {
 	return b
 }
 
-// Reset clears all current state for the builder.
-func (b *Builder) Reset(base Labels) {
-	b.base = base
-	b.del = b.del[:0]
-	b.add = b.add[:0]
-	b.base.Range(func(l Label) {
-		if l.Value == "" {
-			b.del = append(b.del, l.Name)
-		}
-	})
-}
-
 // Del deletes the label of the given name.
 func (b *Builder) Del(ns ...string) *Builder {
 	for _, n := range ns {

model/labels/labels_stringlabels.go

@@ -458,6 +458,25 @@ func (ls *Labels) InternStrings(intern func(string) string) {
 func (ls Labels) ReleaseStrings(release func(string)) {
 }
 
+// Builder allows modifying Labels.
+type Builder struct {
+	base Labels
+	del  []string
+	add  []Label
+}
+
+// Reset clears all current state for the builder.
+func (b *Builder) Reset(base Labels) {
+	b.base = base
+	b.del = b.del[:0]
+	b.add = b.add[:0]
+	b.base.Range(func(l Label) {
+		if l.Value == "" {
+			b.del = append(b.del, l.Name)
+		}
+	})
+}
+
 // Labels returns the labels from the builder.
 // If no modifications were made, the original labels are returned.
 func (b *Builder) Labels() Labels {