JVM_IR: fix Result types in continuations & remove more codegen hacks

#KT-47129 Fixed

compiler/testData/codegen/box/coroutines/inlineClasses/kt47129.kt

@@ -0,0 +1,17 @@
+// WITH_RUNTIME
+import kotlin.coroutines.*
+
+fun <T> runBlocking(c: suspend () -> T): T {
+    var res: T? = null
+    c.startCoroutine(Continuation(EmptyCoroutineContext) {
+        res = it.getOrThrow()
+    })
+    return res!!
+}
+
+fun box(): String = runBlocking {          // Non-inline lambda;
+    run {                                  // In it an inline lambda
+        val foo = { Result.success("OK") } // Unboxes Result.
+        foo().getOrNull()!!
+    }
+}