[Bug target/95237] LOCAL_DECL_ALIGNMENT shrinks alignment, FAIL gcc.target/i386/pr69454-2.c

[kito at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95237

--- Comment #6 from Kito Cheng <kito at gcc dot gnu.org> ---
Created attachment 48658
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48658&action=edit
i386-Implement-ROUND_TYPE_ALIGN-to-make-sure-alignme.patch

Some optimization might made decision depend on the alignment, and alignment
shrinking might made the decision become wrong.

So I prefer keep the assertion checking and implement ROUND_TYPE_ALIGN for x86,
so that it will set the alignment properly from the beginning.

PoC/untested  patch attached.