internal/pkg: input iterator via IR cache

Primarily useful for garbage collection.

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

internal/rosa/llvm_test.go

@@ -0,0 +1,21 @@
+package rosa_test
+
+import (
+	"testing"
+
+	"hakurei.app/internal/pkg"
+	"hakurei.app/internal/rosa"
+)
+
+func TestLLVMInputs(t *testing.T) {
+	const wantInputCount = 688
+
+	_, llvm := rosa.Native().Std().MustLoad(rosa.H("llvm"))
+	var n int
+	for range pkg.Inputs(llvm) {
+		n++
+	}
+	if n != wantInputCount {
+		t.Errorf("Inputs: %d, want %d", n, wantInputCount)
+	}
+}