[FIR] Extract non-null info from x?.y!! ^KT-44513 Fixed

compiler/testData/diagnostics/tests/inference/regressions/kt702.fir.kt

@@ -1,20 +0,0 @@
-//KT-702 Type inference failed
-package a
-//+JDK
-
-fun <T> getJavaClass() : java.lang.Class<T> { <!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>
-
-public class Throwables() {
-    companion object {
-        public fun <X : Throwable?> propagateIfInstanceOf(throwable : Throwable?, declaredType : Class<X?>?) : Unit {
-            if (((throwable != null) && declaredType?.isInstance(throwable)!!))
-            {
-                throw declaredType?.cast(throwable)!!
-            }
-        }
-        public fun propagateIfPossible(throwable : Throwable?) : Unit {
-            propagateIfInstanceOf(throwable, getJavaClass<Error?>()) // Type inference failed: Mismatch while expanding constraints
-            propagateIfInstanceOf(throwable, getJavaClass<RuntimeException?>()) // Type inference failed: Mismatch while expanding constraints
-        }
-    }
-}

compiler/testData/diagnostics/tests/inference/regressions/kt702.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 //KT-702 Type inference failed
 package a
 //+JDK