[lldb] [llvm] [LLDB][Process] Add LSX and LASX register definitions and operations on the LoongArch64 (PR #120664)

[David Spickett via llvm-commits]

https://github.com/DavidSpickett commented:

I should have said this before you wrote out all these tests, so apologies for this up front, but - 

There's no reason these tests need to be native, host only, tests. Cross compiling them is not a problem. So I'd like to see these as API tests instead, using Python. The nice thing about that is you can merge a lot of it into one file.

I think it makes sense to add a LoongArch folder next to the AArch64 one in test/API/linux, and write a test like: https://github.com/llvm/llvm-project/tree/main/lldb/test/API/linux/aarch64/tls_registers

You can then have one program file with functions to write in each of the ways you need. You will have to pass some argument to the program to tell it what to do, as calling these functions via expressions will not change anything because lldb will ("helpfully" :) ) restore these registers afterwards.

You can also set breakpoints wherever you want, without having to manually skip breakpoints already in the code.

You can add something like `isAArch64SME` to look for the CPU features you need in /proc/cpuinfo, same thing for skipping if it's not LoongArch.

The program code and the values you check for are fine as is, the setup just needs to be a bit more flexible.

https://github.com/llvm/llvm-project/pull/120664