[Bug c/71602] [6/7 regression] ICE on __builtin_va_arg in build_va_arg, at c-family/c-common.c:5810

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71602

--- Comment #4 from vries at gcc dot gnu.org ---
Created attachment 38736
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38736&action=edit
tentative patch