[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/smartCasts/elvis/basicOff.fir.kt

@@ -0,0 +1,50 @@
+// !LANGUAGE: -BooleanElvisBoundSmartCasts
+
+interface Order {
+    val expired: Boolean?
+
+    fun notExpired(): Boolean
+
+    fun doSomething()
+}
+
+fun foo(o: Any) {
+    val order = o as? Order
+    if (order?.expired ?: false) {
+        order.<!INAPPLICABLE_CANDIDATE!>doSomething<!>()
+    }
+    else {
+
+    }
+    if (order?.notExpired() ?: false) {
+        order.<!INAPPLICABLE_CANDIDATE!>doSomething<!>()
+    }
+}
+
+fun bar(o: Any) {
+    val order = o as? Order
+    if (order?.expired ?: true) {
+
+    }
+    else {
+        order!!.doSomething()
+    }
+    if (order?.notExpired() ?: true) {
+
+    }
+    else {
+        order!!.doSomething()
+    }
+}
+
+fun baz(o: Boolean?) {
+    if (o ?: false) {
+        o.<!INAPPLICABLE_CANDIDATE!>hashCode<!>()
+    }
+    if (o ?: true) {
+
+    }
+    else {
+        o.<!INAPPLICABLE_CANDIDATE!>hashCode<!>()
+    }
+}

compiler/testData/diagnostics/tests/smartCasts/elvis/basicOn.fir.kt

@@ -0,0 +1,50 @@
+// !LANGUAGE: +BooleanElvisBoundSmartCasts
+
+interface Order {
+    val expired: Boolean?
+
+    fun notExpired(): Boolean
+
+    fun doSomething()
+}
+
+fun foo(o: Any) {
+    val order = o as? Order
+    if (order?.expired ?: false) {
+        order.<!INAPPLICABLE_CANDIDATE!>doSomething<!>()
+    }
+    else {
+
+    }
+    if (order?.notExpired() ?: false) {
+        order.<!INAPPLICABLE_CANDIDATE!>doSomething<!>()
+    }
+}
+
+fun bar(o: Any) {
+    val order = o as? Order
+    if (order?.expired ?: true) {
+
+    }
+    else {
+        order!!.doSomething()
+    }
+    if (order?.notExpired() ?: true) {
+
+    }
+    else {
+        order!!.doSomething()
+    }
+}
+
+fun baz(o: Boolean?) {
+    if (o ?: false) {
+        o.<!INAPPLICABLE_CANDIDATE!>hashCode<!>()
+    }
+    if (o ?: true) {
+
+    }
+    else {
+        o.<!INAPPLICABLE_CANDIDATE!>hashCode<!>()
+    }
+}

compiler/testData/diagnostics/tests/smartCasts/elvis/impossible.fir.kt

@@ -0,0 +1,41 @@
+// !WITH_NEW_INFERENCE
+// !LANGUAGE: +BooleanElvisBoundSmartCasts
+// See KT-20752
+
+class Unstable {
+    val first: String? get() = null
+}
+
+class StringList {
+    fun remove(s: String) = s
+}
+
+fun StringList.remove(s: String?) = s ?: ""
+
+fun String.isEmpty() = this == ""
+
+fun foo(list: StringList, arg: Unstable) {
+    list.remove(arg.first)
+    if (arg.first?.isEmpty() ?: false) {
+        // Should be still resolved to extension, without smart cast or smart cast impossible
+        list.remove(arg.first)
+    }
+}
+
+class UnstableBoolean {
+    val first: Boolean? get() = null
+}
+
+class BooleanList {
+    fun remove(b: Boolean) = b
+}
+
+fun BooleanList.remove(b: Boolean?) = b ?: false
+
+fun bar(list: BooleanList, arg: UnstableBoolean) {
+    list.remove(arg.first)
+    if (arg.first ?: false) {
+        // Should be still resolved to extension, without smart cast or smart cast impossible
+        list.remove(arg.first)
+    }
+}