https://github.com/labath created 
https://github.com/llvm/llvm-project/pull/139545

The macos and sysv ABIs return functionally equivalent unwind plans, so they 
can be implemented in the base AArch64 class. The only difference between them 
was that the macos plan provided a "pc=lr" rule whereas the sysv plan called 
SetReturnAddressRegister (which causes the unwind machinery to act as if that 
rule was present). This difference was enough to cause 
`CompareUnwindPlansForIdenticalInitialPCLocation` to return a different value 
and break the (temporarily reverted) TestUnwindFramelessFaulted test.

While merging the two functions, I couldn't stop myself from simplifying them 
to use the generic register number schemes -- which exposed another bug in 
CompareUnwindPlansForIdenticalInitialPCLocation, namely that it was expecting 
all unwind plans to use the LLDB numbering scheme. This patch fixes that as 
well.

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