[LoongArch64] Modify dwarfReg in native llvm-libunwind to be consistent with the LoongArch manual.

[sunlijun-610]

Change the UNW_LOONGARCH of F0-F31 from 32-63 to 64-95.

[sunlijun-610]

@shushanhf @MichalStrehovsky Could you review this PR?
Thanks!

[shushanhf]

LGTM
Thanks

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[jkotas]

This is vendored project from https://github.com/llvm/llvm-project/blob/main/libunwind/include/libunwind.h#L1269 . Is this a bug in the upstream project? If yes, could you please make sure that this fix is upstreamed to https://github.com/llvm/llvm-project as well?

[shushanhf]

Thanks very much~!
You are right.
The jit/unwindloongarch64.cpp is too old.

we have to follow the latest la-abi speci https://github.com/loongson/la-abi-specs/blob/release/ladwarf.adoc
And we have to modify this file https://github.com/dotnet/runtime/blob/main/src/coreclr/jit/unwindarm64.cpp#L21

Also thanks @filipnavara

We will close this PR and push a new PR to modify the unwindarm64.cpp.

[sunlijun-610]

The new PR for modifying jit/unwindloongarch64.cpp has been submitted to #106382
And this PR can be closed.