ObjCExport: prohibit Kotlin exceptions leaking through native code back

If a Kotlin exceptions is thrown out of a native code in ObjCExport
(when calling Swift/Obj-C method overriding Kotlin method, or calling
Swift/Obj-C block as Kotlin function type), treat this exception as
fatal and terminate the process.
This could happen if the Kotlin exception leaked from Kotlin to native
code before.
In other words, when calling Kotlin -> Swift/Obj-C -> Kotlin, if Kotlin
exception passes from the last to the first part, terminate.

^KT-50830

kotlin-native/backend.native/tests/objcexport/values.kt

@@ -504,17 +504,7 @@ fun runUnitBlock(block: () -> Unit): Boolean {
 
 fun asUnitBlock(block: () -> Any?): () -> Unit = { block() }
 
-fun runNothingBlock(block: () -> Nothing) = try {
-    block()
-    false
-} catch (e: Throwable) {
-    true
-}
-
-fun asNothingBlock(block: () -> Any?): () -> Nothing = {
-    block()
-    TODO()
-}
+fun runNothingBlock(block: () -> Nothing) { (block as () -> Any?)() }
 
 fun getNullBlock(): (() -> Unit)? = null
 fun isBlockNull(block: (() -> Unit)?): Boolean = block == null