add test

Change-Id: I0db78c67fcb1e7f2f2aaeed06a54414e634e8ab3

test/codegen/load_type_from_itab.go

@@ -0,0 +1,24 @@
+// asmcheck
+
+// Copyright 2025 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This test makes sure that we statically load a type from an itab, instead
+// of doing a indirect load from thet itab.
+
+package codegen
+
+type M interface{ M() }
+type A interface{ A() }
+
+type Impl struct{}
+
+func (*Impl) M() {}
+func (*Impl) A() {}
+
+func main() {
+	var a M = &Impl{}
+	// amd64:`LEAQ\ttype:.*Impl`
+	a.(A).A()
+}