[strong] Allow mutually recursive classes.

test/mjsunit/strong/declaration-after-use.js

Index: test/mjsunit/strong/declaration-after-use.js
diff --git a/test/mjsunit/strong/declaration-after-use.js b/test/mjsunit/strong/declaration-after-use.js
index 3f5039249bad827c4ac2405892957b6aeee9e9cd..020067c1e5aa3c56d8da5e58788235a868b987ac 100644
--- a/test/mjsunit/strong/declaration-after-use.js
+++ b/test/mjsunit/strong/declaration-after-use.js
@@ -33,6 +33,10 @@ function assertThrowsHelper(code) {
   assertThrowsHelper("function f() { x; let x = 0; }");
   assertThrowsHelper("function f() { x; } let x = 0;");
 
+  assertThrowsHelper("x; const x = 0;");
+  assertThrowsHelper("function f() { x; const x = 0; }");
+  assertThrowsHelper("function f() { x; } const x = 0;");
+
   // These tests needs to be done a bit more manually, since var is not allowed
   // in strong mode:
   assertThrows(
@@ -78,6 +82,16 @@ function assertThrowsHelper(code) {
 
 
 (function DeclarationAfterUseInClasses() {
+  // Referring to a variable declared later
+  assertThrowsHelper("class C { m() { x; } } let x = 0;");
+  assertThrowsHelper("class C { static m() { x; } } let x = 0;");
+  assertThrowsHelper("class C { [x]() { } } let x = 0;");
+
+  assertThrowsHelper("class C { m() { x; } } const x = 0;");
+  assertThrowsHelper("class C { static m() { x; } } const x = 0;");
+  assertThrowsHelper("class C { [x]() { } } const x = 0;");
+
+  // Referring to the class name.
   assertThrowsHelper("class C extends C { }");
   assertThrowsHelper("let C = class C2 extends C { }");
   assertThrowsHelper("let C = class C2 extends C2 { }");