[Bug c++/70393] [5/6 Regression] Miscompilation: missing constructor call for static object

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70393

--- Comment #6 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Indeed, manually editing the assembly to such an initializer results in  a
working program.

The CONSTRUCTOR created for ab's  DECL_INITIAL has the correct things in it,
but in declaration  order.  I.e. it looks like:
IDX=field-for-A-base VAL=CONSTRUCTOR (...)
IDX=field-for-B-base VAL=CONSTRUCTOR (...)

I think CONSTRUCTOR_ELTs are expected to be in ascending placement order?