Introduce warnings reporting by missed constraints because of incorrect optimization in the constraints processor

compiler/testData/codegen/box/inference/kt42042.kt

@@ -0,0 +1,15 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+
+sealed class Subtype<A1, B1> {
+    abstract fun cast(value: A1): B1
+    class Trivial<A2 : B2, B2> : Subtype<A2, B2>() {
+        override fun cast(value: A2): B2 = value
+    }
+}
+
+fun <A, B> unsafeCast(value: A): B {
+    val proof: Subtype<A, B> = Subtype.Trivial()
+    return proof.cast(value)
+}
+
+fun box() = "OK"