MaskRay wrote:

> So PPC64 can use ELFv2 for `Triple::OpenBSD`. We probably want to diagnose 
> this OS for PPC64, since with ELFv2 we might emit separate local and global 
> entry points which means only certain values can be passed to 
> `-fpatchable-function-entry` option.

This patch matches the intended end result: NOPs before the global entry and 
after the local entry.

The current way GCC handles `N,M` where M>0 is undesired and will hopefully be 
soon changed: https://gcc.gnu.org/pipermail/gcc-patches/2024-May/651025.html , 
matching what I suggested in 2022: 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99888#c5

https://github.com/llvm/llvm-project/pull/92997
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