The debugger and debug scopes code use AllFramesIter. Currently they skip Ion frames because IonMonkey is disabled in debug mode, but the baseline compiler will be enabled in debug mode, so AllFramesIter has to know about these frames.

Makes AllFramesIter iterate over Ion frames. Very similar to the StackIter implementation, but this only handles scripted, non-inlined frames. For baseline jit frames we can then make AllFramesIter::taggedFramePtr return a valid frame pointer. Like StackIter, isIon means baseline-or-Ion-optimized frame, when we remove JM we can rename it to isJIT. On the baseline-jit branch I will add a new method to filter optimized frames. As far as I know these patches should cover most of the VM changes we need to support jsdbg2. Eval-in-frame and JSD will need some work, but first I want to see if this works so far, so I will deal with them later.

Comment on attachment 701206 [details] [diff] [review] Patch Great!