When binding x = e, we now attach an unfolding to 'x' even if
it won't be used because SimplGently is on.
Reason: the specialiser runs right after SimplGently, and it (now)
only gathers call information for calls whose dictionary arguments are
"interesting" -- i.e. have an unfolding of some kind.
old_info = idInfo old_bndr
occ_info = occInfo old_info
wkr = substWorker env (workerInfo old_info)
- omit_unfolding = isNonRuleLoopBreaker occ_info || not (activeInline env old_bndr)
+ omit_unfolding = isNonRuleLoopBreaker occ_info
+ -- or not (activeInline env old_bndr)
+ -- Do *not* trim the unfolding in SimplGently, else
+ -- the specialiser can't see it!
-----------------
addPolyBind :: TopLevelFlag -> SimplEnv -> OutBind -> SimplEnv