Max Winkler ce3485a0cd [llvm][GlobalOpt] Remove empty atexit destructors/handlers (#88836) ...

https://godbolt.org/z/frjhqMKqc for an example.

Removal of allocations due to empty `__cxa_atexit` destructor calls is
done by the following globalopt pass.
This pass currently does not look for `atexit` handlers generated for
platforms that do not use `__cxa_atexit`.
By default Win32 and AIX use `atexit`.

I don't see an easy way to only remove `atexit` calls that the compiler
generated without looking at the generated mangled name of the atexit
handler that is being registered.
However we can easily remove all `atexit` calls that register empty
handlers since it is trivial to ensure the removed call still returns
`0` which is the value for success.

2024-04-29 20:29:34 -04:00

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