[PATCH] csa: Fix --enable-checking=yes, df bootstrap failure in csa [PR94961]

[Eric Botcazou]

> Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux, plus
> tested with yes,df checking build/regtest on x86_64-linux (which previously
> failed), ok for trunk?
> 
> 2020-05-06  Jakub Jelinek  <jakub@redhat.com>
> 
> 	PR bootstrap/94961
> 	PR rtl-optimization/94516
> 	* combine-stack-adj.c (try_apply_stack_adjustment): Call
> 	df_notes_rescan after calling remove_reg_equal_equiv_notes.

Do you need to backport this onto some branches?  Otherwise, it would probably 
be better to do in remove_reg_equal_equiv_notes what is done in remove_note.

-- 
Eric Botcazou