[Bug debug/104407] [10/11/12 Regression] '-fcompare-debug' failure (length) w/ -std=c++17 -O1

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104407

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

           What    |Removed                     |Added
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  Attachment #52362|0                           |1
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--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 52364
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52364&action=edit
gcc12-pr104407.patch

Updated patch.  Hope it doesn't do more harm for -fcompare-debug, I'm not
really sure if e.g. mangling something doesn't force some instantiations that
wouldn't otherwise happen.  And this patch can mangle even things that weren't
mangled before with the PR96690 change, though I guess reference_to_unused
calls during early_dwarf are just random lottery.