internal/rosa: pass stage alongside state

This cleans up many function signatures.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/rosa_test.go

@@ -78,7 +78,7 @@ func TestCureAll(t *testing.T) {
 	t.Parallel()
 
 	for _, p := range rosa.Native().Collect() {
-		a, _ := rosa.Native().Load(rosa.Std, p)
+		a, _ := rosa.Native().Std().MustLoad(p)
 		meta := rosa.Native().MustGet(p)
 		t.Run(meta.Name, func(t *testing.T) {
 			t.Parallel()
@@ -93,13 +93,13 @@ func TestCureAll(t *testing.T) {
 }
 
 func BenchmarkStage3(b *testing.B) {
-	s := rosa.Native().Clone()
+	t := rosa.Native().Clone().Std()
 
 	for b.Loop() {
-		s.Load(rosa.Std, rosa.LLVM)
+		t.MustLoad(rosa.LLVM)
 
 		b.StopTimer()
-		s.DropCaches("", 0)
+		t.DropCaches("", 0)
 		b.StartTimer()
 	}
 }