[Bug middle-end/119482] slow compilation on ladybird interpreter

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119482

--- Comment #23 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>It uses flatten. With flatten gcc compilation is a lot slower (40+s) vs clang (6s). 

So it turns out that is because flatten in GCC and LLVM do 2 different things.
GCC flattens all levels of the call while LLVM just does the first level of
calls. 

I found this out on accident:
https://discourse.llvm.org/t/rfc-function-level-flatten-depth-attribute-for-depth-limited-inlining/89017

So maybe this is works as expected ....