all: move OptimizeMaps to transforms and add tests

transform/maps_test.go

@@ -0,0 +1,22 @@
+package transform
+
+import (
+	"testing"
+
+	"tinygo.org/x/go-llvm"
+)
+
+func TestOptimizeMaps(t *testing.T) {
+	t.Parallel()
+	testTransform(t, "testdata/maps", func(mod llvm.Module) {
+		// Run optimization pass.
+		OptimizeMaps(mod)
+
+		// Run an optimization pass, to clean up the result.
+		// This shows that all code related to the map is really eliminated.
+		pm := llvm.NewPassManager()
+		defer pm.Dispose()
+		pm.AddDeadStoreEliminationPass()
+		pm.Run(mod)
+	})
+}