Make loop_mask() return mask_true() for Broadcast/Gather proxies
In !2626 (merged) support was added for zip proxy types that gather (sparse elements using a list of indices) or broadcast (duplicate a single element), in addition to the old 'load' proxies (contiguous elements starting from an index).
This just tweak the loop_mask()
to return true for all elements of gather/broadcast proxies.
Should be tested with Rec!2134 (merged) and Moore!562 (merged).
Edited by Olli Lupton