FIR: extend SAM conversion to subtype of functional type

compiler/testData/ir/irText/expressions/funInterface/samConversionsWithSmartCasts.fir.kt.txt

@@ -14,29 +14,29 @@ fun run2(r1: KRunnable, r2: KRunnable) {
 }
 
 fun <T> test0(a: T) where T : KRunnable, T : Function0<Unit> {
-  run1(r = a)
+  run1(r = a /*-> KRunnable */)
 }
 
 fun test1(a: Function0<Unit>) {
   when {
-    a is KRunnable -> run1(r = a /*as KRunnable */)
+    a is KRunnable -> run1(r = a /*as KRunnable */ /*-> KRunnable */)
   }
 }
 
 fun test2(a: KRunnable) {
   a as Function0<Unit> /*~> Unit */
-  run1(r = a /*as Function0<Unit> */)
+  run1(r = a /*as Function0<Unit> */ /*-> KRunnable */)
 }
 
 fun test3(a: Function0<Unit>) {
   when {
-    a is KRunnable -> run2(r1 = a /*as KRunnable */, r2 = a /*as KRunnable */)
+    a is KRunnable -> run2(r1 = a /*as KRunnable */ /*-> KRunnable */, r2 = a /*as KRunnable */ /*-> KRunnable */)
   }
 }
 
 fun test4(a: Function0<Unit>, b: Function0<Unit>) {
   when {
-    a is KRunnable -> run2(r1 = a /*as KRunnable */, r2 = b /*-> KRunnable */)
+    a is KRunnable -> run2(r1 = a /*as KRunnable */ /*-> KRunnable */, r2 = b /*-> KRunnable */)
   }
 }
 
@@ -50,7 +50,7 @@ fun test5x(a: Any) {
   when {
     a is KRunnable -> { // BLOCK
       a /*as KRunnable */ as Function0<Unit> /*~> Unit */
-      run1(r = a /*as KRunnable */)
+      run1(r = a /*as KRunnable */ /*-> KRunnable */)
     }
   }
 }