[Bug target/77728] [5/6/7/8 Regression] Miscompilation multiple vector iteration on ARM

[ramana at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77728

--- Comment #25 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
Created attachment 41255
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41255&action=edit
AArch32 wip patch.

- There are some line > 80 characters, cosmetic issues in this patch . 

- However this appeared to cause regressions in libstdc++ testruns over the
weekend that Iv'e not been able to debug / fix up especially with precompiled
headers with the configuration --with-arch=armv7-a --with-float=hard
--with-fpu=neon.

- I've put this up for some comments and any reviews / additional testing. The
warnings show up on various testcases from the PR.