- Export JSSLOT_ITER_* from jsiter.cpp to jsiter.h, for jstracer.cpp to use.

- Fix OBJ_GET_SLOT to be STOBJ_GET_SLOT in jsiter.cpp, no thread safety here (bug on file).
- Move JSNativeEnumerator from jsobj.cpp to jsobj.h for jstracer.cpp as well.
- Rename JOF_2BYTE JOF_UINT8 for consistency, and actually decompile it.
- Trace JSOP_FORVAR (can't do anything in JSOP_ITER, it comes before the loop).
- Shortened some guardMyLongSummerVacationWithinBounds names ;-).
- Removed/refactored to avoid dslots_ins obligation on all callers.

js/src/jsobj.cpp

@@ -4129,20 +4129,6 @@ out:
     return JS_TRUE;
 }
 
-/*
- * Private type used to enumerate properties of a native JS object. It is not
- * allocated when there are no enumerable properties in the object. Instead
- * for empty enumerators the code uses JSVAL_ZERO as the enumeration state.
- */
-struct JSNativeEnumerator {
-    uint32              cursor;         /* index into ids array, runs from
-                                           length down to 0 */
-    uint32              length;         /* length of ids array */
-    JSNativeEnumerator  *next;          /* double-linked list support */
-    JSNativeEnumerator  **prevp;
-    jsid                ids[1];         /* enumeration id array */
-};
-
 /*
  * This function is used to enumerate the properties of native JSObjects
  * and those host objects that do not define a JSNewEnumerateOp-style iterator