Handle break / continue / throw in lift return / assignment intentions

So #KT-14900 Fixed

idea/testData/intentions/branched/folding/whenToAssignment/insideLoop.kt

@@ -0,0 +1,13 @@
+fun foo(): Int {
+    var res = 0
+    loop@ while (true) {
+        <caret>when (1) {
+            1 -> res += 1
+            2 -> throw Exception()
+            3 -> break@loop
+            4 -> continue@loop
+            else -> return -1
+        }
+    }
+    return res
+}

idea/testData/intentions/branched/folding/whenToAssignment/insideLoop.kt.after

@@ -0,0 +1,13 @@
+fun foo(): Int {
+    var res = 0
+    loop@ while (true) {
+        res += when (1) {
+            1 -> 1
+            2 -> throw Exception()
+            3 -> break@loop
+            4 -> continue@loop
+            else -> return -1
+        }
+    }
+    return res
+}

idea/testData/intentions/branched/folding/whenToReturn/insideLoop.kt

@@ -0,0 +1,12 @@
+fun foo(): Int {
+    loop@ while (true) {
+        <caret>when (1) {
+            1 -> return 1
+            2 -> throw Exception()
+            3 -> break@loop
+            4 -> continue@loop
+            else -> return -1
+        }
+    }
+    return 0
+}

idea/testData/intentions/branched/folding/whenToReturn/insideLoop.kt.after

@@ -0,0 +1,12 @@
+fun foo(): Int {
+    loop@ while (true) {
+        return when (1) {
+            1 -> 1
+            2 -> throw Exception()
+            3 -> break@loop
+            4 -> continue@loop
+            else -> -1
+        }
+    }
+    return 0
+}