Fix JS source maps for initialization of variables captured by class

js/js.translator/testData/lineNumbers/classCapturingLocals.kt

@@ -0,0 +1,17 @@
+class A
+
+fun A.foo() {
+    val x = baz()
+    class B {
+        fun bar() {
+            println(this@foo)
+            println("A.B.bar: $x")
+        }
+    }
+    println("A.foo: $x")
+    B().bar()
+}
+
+fun baz() = 23
+
+// LINES: 5 5 7 8 * 4 11 12 15

js/js.translator/testData/lineNumbers/innerClass.kt

@@ -0,0 +1,9 @@
+class A(val x: Int) {
+    inner class B {
+        fun foo() {
+            println(x)
+        }
+    }
+}
+
+// LINES: 1 2 4