Basic class members generation.

Split testData into 'classes' and 'expressions'.

compiler/testData/ir/irText/expressions/whileDoWhile.kt

@@ -0,0 +1,17 @@
+fun test() {
+    var x = 0
+    while (x < 0);
+    while (x < 5) x++
+    while (x < 10) { x++ }
+    do while (x < 0)
+    do x++ while (x < 15)
+    do { x ++ } while (x < 20)
+}
+
+fun testSmartcastInCondition() {
+    val a: Any? = null
+    if (a is Boolean) {
+        while (a) {}
+        do {} while (a)
+    }
+}