re PR tree-optimization/40914 (ipa_analyze_call_uses fails to handle ptrmemfunc_vbit_in_delta)
PR tree-optimization/40914
* ipa-prop.c (ipa_get_ptr_load_param): New argument use_delta,
if set, then check the delta field of the PMF record.
(ipa_get_stmt_member_ptr_load_param): Propagate new param use_delta.
(ipa_analyze_call_uses): Handle machines where the vbit for a PMF
call is stored in the delta.