- Avoid unnecessary FASTCALL builtin wrappers for existing js_* library-private or friend functions, which could be (and now are) fastcall (JS_FASTCALL). A couple of builtins avoid name collisions by using js_Fast instead of just js_ as their name prefix.

- Use GCF_DONT_BLOCK from fastcall builtins that call into the GC allocator (mostly; a few places need help still, or better: need to avoid allocation).
- Cope with C clients of jscntxt.h and its include files (these hacks should go away).
- Naming convention and function definition line-break style nit-picks.

js/src/jsiter.cpp

@@ -434,7 +434,7 @@ js_ValueToIterator(JSContext *cx, uintN flags, jsval *vp)
     goto out;
 }
 
-JS_FRIEND_API(JSBool)
+JS_FRIEND_API(bool) JS_FASTCALL
 js_CloseIterator(JSContext *cx, jsval v)
 {
     JSObject *obj;