[IR] Drop ReturnTypeIsNotInitializedException

It was unused since commit a005f2e75d.

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/impl/IrTypeBase.kt

@@ -47,11 +47,6 @@ val IrType.originalKotlinType: KotlinType?
 
 data object IrStarProjectionImpl : IrStarProjection
 
-internal class ReturnTypeIsNotInitializedException(function: IrFunction) : IllegalStateException(
-    "Return type is not initialized for function '${function.name}'"
-)
-
-
 // Please note this type is not denotable which means it could only exist inside type system
 class IrCapturedType(
     val captureStatus: CaptureStatus,

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/RenderIrElement.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 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.
  */
 
@@ -14,7 +14,6 @@ import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.*
 import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.types.*
-import org.jetbrains.kotlin.ir.types.impl.ReturnTypeIsNotInitializedException
 import org.jetbrains.kotlin.ir.types.impl.originalKotlinType
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 import org.jetbrains.kotlin.renderer.DescriptorRenderer
@@ -743,7 +742,7 @@ private fun IrFunction.renderTypeParameters(): String =
 private val IrFunction.safeReturnType: IrType?
     get() = try {
         returnType
-    } catch (e: ReturnTypeIsNotInitializedException) {
+    } catch (e: UninitializedPropertyAccessException) {
         null
     }