cmd/compile: add test that non-name call does not allocate

Updates #57434

Change-Id: Ib90c228f95c3d61204e60f63d7de55884d839e05
Reviewed-on: https://go-review.googlesource.com/c/go/+/459496
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>

src/cmd/compile/internal/test/issue57434_test.go

@@ -0,0 +1,38 @@
+// Copyright 2023 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.
+
+package test
+
+import (
+	"testing"
+)
+
+var output int
+
+type Object struct {
+	Val int
+}
+
+func (o *Object) Initialize() *Object {
+	o.Val = 5
+	return o
+}
+
+func (o *Object) Update() *Object {
+	o.Val = o.Val + 1
+	return o
+}
+
+func TestAutotmpLoopDepth(t *testing.T) {
+	f := func() {
+		for i := 0; i < 10; i++ {
+			var obj Object
+			obj.Initialize().Update()
+			output = obj.Val
+		}
+	}
+	if n := testing.AllocsPerRun(10, f); n > 0 {
+		t.Error("obj moved to heap")
+	}
+}