[K/N] Allow to unset unhandled exception hook ^KT-49228

kotlin-native/backend.native/tests/runtime/exceptions/custom_hook_get.kt

@@ -18,4 +18,9 @@ fun main() {
     val hook1 = getUnhandledExceptionHook()
     assertEquals(exceptionHook, hook1)
     val hook2 = getUnhandledExceptionHook()
+    assertEquals(exceptionHook, hook2)
+    val hook3 = setUnhandledExceptionHook(null)
+    assertEquals(exceptionHook, hook3)
+    val hook4 = getUnhandledExceptionHook()
+    assertNull(hook4)
 }

kotlin-native/runtime/src/main/kotlin/kotlin/native/Runtime.kt

@@ -57,6 +57,17 @@ public typealias ReportUnhandledExceptionHook = Function1<Throwable, Unit>
  * Hook must be a frozen lambda, so that it could be called from any thread/worker.
  */
 @OptIn(FreezingIsDeprecated::class)
+public fun setUnhandledExceptionHook(hook: ReportUnhandledExceptionHook?): ReportUnhandledExceptionHook? {
+    try {
+        return UnhandledExceptionHookHolder.hook.swap(hook)
+    } catch (e: InvalidMutabilityException) {
+        throw InvalidMutabilityException("Unhandled exception hook must be frozen")
+    }
+}
+
+@Suppress("CONFLICTING_OVERLOADS")
+@Deprecated("Provided for binary compatibility", level = DeprecationLevel.HIDDEN)
+@OptIn(FreezingIsDeprecated::class)
 public fun setUnhandledExceptionHook(hook: ReportUnhandledExceptionHook): ReportUnhandledExceptionHook? {
     try {
         return UnhandledExceptionHookHolder.hook.swap(hook)