Multiple fixes of JS source maps

- elvis expression with complex RHS
- destructuring declarations
- decomposition of `var` statement (for example, in case of
  inline destructuring functions)
- `is` LHS &&/|| inline fun RHS
- argument assignment to temporary var on inline call site
- assignment of `next()` result to temporary var in `for` expression
- rethrow statement in exception handler

js/js.translator/testData/lineNumbers/isOperator.kt

@@ -0,0 +1,14 @@
+var log = ""
+
+fun box(a: Any) {
+    if (a is String && foo()) {
+        log += "OK"
+    }
+}
+
+inline fun foo(): Boolean {
+    log += "foo"
+    return true
+}
+
+// LINES: 7 4 4 4 10 10 4 11 4 5 5 12 10 10 11 11 * 1 * 1