[Bug target/106153] Generated arm64 code writing below stack pointer without updating SP

[andy at plausible dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106153

--- Comment #3 from Andy Ross <andy at plausible dot org> ---
Created attachment 53231
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53231&action=edit
Preprocessed source file (gzipped)

Sorry, I thought I attached it with the submission.  Looks like it got kicked
out for being 50 bytes over the limit.  Compressed and resubmitted.  The
macrobatics is admittedly pretty thick in this API, and the expansions are
messy.  The upstream source (discussed in the linked github issue) might help
clarify.