[K/N] Make instance a property not a field

This enables inlining machinery, and allows to avoid frame in simple
cases.

kotlin-native/backend.native/tests/filecheck/no_frame_on_constant_object_access.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+object A {
+    const val x = 5
+}
+
+class B(val z:Int) {
+    companion object {
+        const val y = 7
+    }
+}
+
+object C {
+    val x = listOf(1, 2, 3)
+}
+
+// CHECK-LABEL: define i32 @"kfun:#f(){}kotlin.Int"()
+// CHECK-NOT: EnterFrame
+fun f() = A.x + B.y
+// CHECK: {{^}}epilogue:
+
+// test that assumption on how EnterFrame looks like is not broken
+// CHECK-LABEL: define void @"kfun:#g(){}"()
+// CHECK: EnterFrame
+fun g() {
+    val x = C.x
+}
+// CHECK: {{^}}epilogue:
+
+
+fun main() {
+    f()
+    g()
+}