Elvis -> if-then: handle case with safe cast separately #KT-17816 Fixed

idea/testData/intentions/branched/elvisToIfThen/fakeSafeCast.kt

@@ -0,0 +1,4 @@
+class My(val x: Int?)
+fun foo(arg: Any) {
+    val y = (arg as? My)?.x <caret>?: 42
+}

idea/testData/intentions/branched/elvisToIfThen/fakeSafeCast.kt.after

@@ -0,0 +1,4 @@
+class My(val x: Int?)
+fun foo(arg: Any) {
+    val y = if ((arg as? My)?.x != null) (arg as? My)?.x else 42
+}

idea/testData/intentions/branched/elvisToIfThen/longSafeCast.kt

@@ -0,0 +1,4 @@
+class My(val x: Int)
+fun foo(arg: Any) {
+    val y = (arg as? My)?.x?.hashCode() <caret>?: 42
+}

idea/testData/intentions/branched/elvisToIfThen/longSafeCast.kt.after

@@ -0,0 +1,4 @@
+class My(val x: Int)
+fun foo(arg: Any) {
+    val y = if (arg is My) arg.x.hashCode() else 42
+}

idea/testData/intentions/branched/elvisToIfThen/safeCast.kt

@@ -0,0 +1,4 @@
+class My(val x: Int)
+fun foo(arg: Any) {
+    val y = (arg as? My)?.x <caret>?: 42
+}

idea/testData/intentions/branched/elvisToIfThen/safeCast.kt.after

@@ -0,0 +1,4 @@
+class My(val x: Int)
+fun foo(arg: Any) {
+    val y = if (arg is My) arg.x else 42
+}

idea/testData/intentions/branched/elvisToIfThen/safeCastUnstable.kt

@@ -0,0 +1,5 @@
+class My(var z: Any, val x: Int) {
+    fun foo() {
+        val y = (z as? My)?.x <caret>?: 42
+    }
+}

idea/testData/intentions/branched/elvisToIfThen/safeCastUnstable.kt.after

@@ -0,0 +1,6 @@
+class My(var z: Any, val x: Int) {
+    fun foo() {
+        val z1 = z
+        val y = if (z1 is My) z1 else 42
+    }
+}

idea/testData/intentions/branched/elvisToIfThen/simpleSafeCast.kt

@@ -0,0 +1,4 @@
+class My(val x: Int)
+fun foo(arg: Any) {
+    val y = arg as? My <caret>?: My(42)
+}

idea/testData/intentions/branched/elvisToIfThen/simpleSafeCast.kt.after

@@ -0,0 +1,4 @@
+class My(val x: Int)
+fun foo(arg: Any) {
+    val y = if (arg is My) arg else My(42)
+}