Constructors represented "as in Java".

TODO: extract nested initializers somehow.

compiler/testData/ir/irText/classes/initVal.kt

@@ -0,0 +1,13 @@
+class TestInitValFromParameter(val x: Int)
+
+class TestInitValInClass {
+    val x = 0
+}
+
+class TestInitValInInitBlock {
+    val x: Int
+    init {
+        x = 0
+    }
+}
+