JVM_IR: unwrap suspend views when generating SAM wrappers

If the super class is in a file that has already been lowered, the base
method has an extra continuation parameter which breaks things.

Also, SAM wrappers around functional objects are tail-call and do not
need continuations ever, so don't even try.

^KT-50950 Fixed

compiler/testData/codegen/box/coroutines/featureIntersection/funInterface/kt50950.kt

@@ -0,0 +1,21 @@
+// IGNORE_BACKEND: JVM
+// WITH_COROUTINES
+// WITH_STDLIB
+// FILE: a.kt
+fun interface A {
+    suspend fun run()
+}
+
+// FILE: b.kt
+import kotlin.coroutines.*
+import kotlin.coroutines.intrinsics.*
+import helpers.EmptyContinuation
+
+suspend fun run(block: suspend () -> Unit) = A(block).run()
+
+fun box(): String {
+    suspend {
+        run {}
+    }.startCoroutine(EmptyContinuation)
+    return "OK"
+}