SLC: drop the assertion that class context shouldn't be null

...because it can be null if an anonymous object is returned as a value
of reified inline function, which isn't materialized as LC element.

^KT-59537 Fixed

compiler/testData/asJava/lightClasses/lightClassByPsi/facades/reifiedInlineReturnsObject.fir.java

@@ -0,0 +1,17 @@
+final class null /* null*/ extends PaginatedTableModel<R> {
+  @java.lang.Override()
+  @org.jetbrains.annotations.NotNull()
+  public java.util.List<R> getRows();//  getRows()
+
+  private  ();//  .ctor()
+}
+
+public abstract class PaginatedTableModel /* PaginatedTableModel*/<R>  {
+  @org.jetbrains.annotations.NotNull()
+  public abstract java.util.List<R> getRows();//  getRows()
+
+  public  PaginatedTableModel(int);//  .ctor(int)
+}
+
+public final class ReifiedInlineReturnsObjectKt /* ReifiedInlineReturnsObjectKt*/ {
+}

compiler/testData/asJava/lightClasses/lightClassByPsi/facades/reifiedInlineReturnsObject.java

@@ -0,0 +1,16 @@
+final class null /* null*/ extends PaginatedTableModel<R> {
+  @org.jetbrains.annotations.NotNull()
+  public java.util.List<R> getRows();//  getRows()
+
+  private  ();//  .ctor()
+}
+
+public abstract class PaginatedTableModel /* PaginatedTableModel*/<R>  {
+  @org.jetbrains.annotations.NotNull()
+  public abstract java.util.List<R> getRows();//  getRows()
+
+  public  PaginatedTableModel(int);//  .ctor(int)
+}
+
+public final class ReifiedInlineReturnsObjectKt /* ReifiedInlineReturnsObjectKt*/ {
+}

compiler/testData/asJava/lightClasses/lightClassByPsi/facades/reifiedInlineReturnsObject.kt

@@ -0,0 +1,9 @@
+abstract class PaginatedTableModel<R>(initialPageSize: Int) {
+    abstract val rows: List<R>
+}
+
+inline fun <reified R> MutableList<R>.asTableModel(pageSize : Int = 42) =
+    object : PaginatedTableModel<R>(pageSize) {
+        override val rows
+            get() = this@asTableModel
+    }

compiler/testData/asJava/lightClasses/lightClassByPsi/facades/reifiedInlineReturnsObject.lib.java

@@ -0,0 +1,9 @@
+public abstract class PaginatedTableModel /* PaginatedTableModel*/<R>  {
+  @org.jetbrains.annotations.NotNull()
+  public abstract java.util.List<R> getRows();//  getRows()
+
+  public  PaginatedTableModel(int);//  .ctor(int)
+}
+
+public final class ReifiedInlineReturnsObjectKt /* ReifiedInlineReturnsObjectKt*/ {
+}