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

[jakub at gcc dot gnu.org]

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

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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  Attachment #41262|0                           |1
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--- Comment #34 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 41263
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41263&action=edit
gcc7-pr77728.patch

Further tweak, so that we don't emit the note twice on fn1 and fn3 in the
testcase.  Seems during expand_function_start, we only want to warn in
FUNCTION_ARG_BOUNDARY hook, because all the interesting cases are seen there,
while not in FUNCTION_ARG hook.  But when in expand_call, we need FUNCTION_ARG.