Add BE tests for 'break' and 'continue' inside 'when'

compiler/testData/codegen/box/controlStructures/continueInWhen.kt

@@ -0,0 +1,49 @@
+// !LANGUAGE: +AllowBreakAndContinueInsideWhen
+
+fun testFor() {
+    val xs = IntArray(10) { i -> i }
+    var k = 0
+    var s = ""
+    for (x in xs) {
+        ++k
+        when {
+            k > 2 -> continue
+        }
+        s += "$k;"
+    }
+    if (s != "1;2;") throw AssertionError(s)
+}
+
+fun testWhile() {
+    var k = 0
+    var s = ""
+    while (k < 10) {
+        ++k
+        when {
+            k > 2 -> continue
+        }
+        s += "$k;"
+    }
+    if (s != "1;2;") throw AssertionError(s)
+}
+
+fun testDoWhile() {
+    var k = 0
+    var s = ""
+    do {
+        ++k
+        when {
+            k > 2 -> continue
+        }
+        s += "$k;"
+    } while (k < 10)
+    if (s != "1;2;") throw AssertionError(s)
+}
+
+fun box(): String {
+    testFor()
+    testWhile()
+    testDoWhile()
+
+    return "OK"
+}