[K2] Prohibit smart casts for 'expect' properties

^KT-61340

compiler/testData/diagnostics/tests/multiplatform/smartCasts/kt61340_commonCode.fir.kt

@@ -0,0 +1,25 @@
+// !DIAGNOSTICS: -DEBUG_INFO_SMARTCAST
+// MODULE: m1-common
+// FILE: common.kt
+
+expect val foo: Any
+
+expect class Bar() {
+    val bus: Any
+}
+
+fun common() {
+    if (foo is String) <!SMARTCAST_IMPOSSIBLE!>foo<!>.length
+
+    val bar = Bar()
+    if (bar.bus is String) <!SMARTCAST_IMPOSSIBLE!>bar.bus<!>.length
+}
+
+// MODULE: m1-jvm()()(m1-common)
+// FILE: jvm.kt
+actual val foo: Any = 2
+
+actual class Bar actual constructor() {
+    actual val bus: Any
+        get() = "bus"
+}

compiler/testData/diagnostics/tests/multiplatform/smartCasts/kt61340_commonCode.kt

@@ -0,0 +1,25 @@
+// !DIAGNOSTICS: -DEBUG_INFO_SMARTCAST
+// MODULE: m1-common
+// FILE: common.kt
+
+expect val foo: Any
+
+expect class Bar() {
+    val bus: Any
+}
+
+fun common() {
+    if (foo is String) foo.length
+
+    val bar = Bar()
+    if (bar.bus is String) <!SMARTCAST_IMPOSSIBLE{JVM}!>bar.bus<!>.length
+}
+
+// MODULE: m1-jvm()()(m1-common)
+// FILE: jvm.kt
+actual val foo: Any = 2
+
+actual class Bar actual constructor() {
+    actual val bus: Any
+        get() = "bus"
+}

compiler/testData/diagnostics/tests/multiplatform/smartCasts/kt61340_platformCode.kt

@@ -0,0 +1,26 @@
+// FIR_IDENTICAL
+// !DIAGNOSTICS: -DEBUG_INFO_SMARTCAST
+// MODULE: m1-common
+// FILE: common.kt
+
+expect val foo: Any
+
+expect class Bar() {
+    val bus: Any
+}
+
+// MODULE: m1-jvm()()(m1-common)
+// FILE: jvm.kt
+actual val foo: Any = 2
+
+actual class Bar actual constructor() {
+    actual val bus: Any
+        get() = "bus"
+}
+
+fun platform() {
+    if (foo is String) foo.length
+
+    val bar = Bar()
+    if (bar.bus is String) <!SMARTCAST_IMPOSSIBLE!>bar.bus<!>.length
+}