Fix generation of JS source maps for class properties

js/js.translator/testData/lineNumbers/delegateMemberVal.kt

@@ -0,0 +1,10 @@
+class A {
+    val z by
+            lazy { 23 }
+}
+
+fun foo() {
+    println(A().z)
+}
+
+// LINES: 2 3 * 3 * 7

js/js.translator/testData/lineNumbers/valParameter.kt

@@ -0,0 +1,10 @@
+class A(
+        val x: Int,
+        val y: String
+)
+
+fun foo() {
+    A(23, "foo")
+}
+
+// LINES: 2 3 * 7