Elvis -> if intention: don't produce boilerplate code for return/break/continue/throw in RHS

#KT-14369 Fixed

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

@@ -0,0 +1,5 @@
+fun foo(s: String?) {
+    while (true) {
+        val t = s?.hashCode() ?:<caret> break
+    }
+}

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

@@ -0,0 +1,6 @@
+fun foo(s: String?) {
+    while (true) {
+        val t = s?.hashCode()
+        if (t == null) break
+    }
+}

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

@@ -0,0 +1,5 @@
+fun foo(s: String?) {
+    while (true) {
+        val t = s?.hashCode() ?:<caret> continue
+    }
+}

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

@@ -0,0 +1,6 @@
+fun foo(s: String?) {
+    while (true) {
+        val t = s?.hashCode()
+        if (t == null) continue
+    }
+}

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

@@ -0,0 +1,3 @@
+fun foo(s: String?) {
+    val t = s?.hashCode() ?:<caret> return
+}

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

@@ -0,0 +1,4 @@
+fun foo(s: String?) {
+    val t = s?.hashCode()
+    if (t == null) return
+}

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

@@ -0,0 +1,4 @@
+// WITH_RUNTIME
+fun foo(s: String?) {
+    val t = s?.hashCode() ?:<caret> throw Exception()
+}

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

@@ -0,0 +1,5 @@
+// WITH_RUNTIME
+fun foo(s: String?) {
+    val t = s?.hashCode()
+    if (t == null) throw Exception()
+}

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

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

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

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