[Bug target/111107] i686-w64-mingw32 does not realign stack when __attribute__((aligned)) or __attribute__((vector_size)) are used

[lh_mouse at 126 dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111107

LIU Hao <lh_mouse at 126 dot com> changed:

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--- Comment #28 from LIU Hao <lh_mouse at 126 dot com> ---
Created attachment 61236
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61236&action=edit
proposed patch #2

It might not be safe to decrease the preferred stack boundary, so let's keep it
as 16, but initialize `ix86_default_incoming_stack_boundary` to 4 bytes
instead.