[C++ Patch] PR 84350 ("[7/8 Regression] ICE with new and auto")

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

today I spent some time on this: basing on r245826, when we started 
ICEing. For example I wondered if we wanted to rework the use of 
do_auto_deduction from build_new, and check CLASS_PLACEHOLDER_TEMPLATE 
(auto_node) and possibly directly call do_class_deduction when d_init 
stays NULL_TREE because vec_safe_length (*init) != 1 ( 
https://gcc.gnu.org/viewcvs/gcc/trunk/gcc/cp/init.c?r1=245826&r2=245825&pathrev=245826 
). But that would require a non-static do_class_deduction and an 
additional function call from build_new, not at all sure it's worth it. 
Thus I'm just proposing the below, restoring the old diagnostic and 
avoiding the ICE.

Thanks, Paolo.

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