[libunwind] [Mips] Fixed libunwind::Registers_mips_o32::jumpto to allow for load delay (PR #152942)

[Fangrui Song via cfe-commits]

https://github.com/MaskRay commented:

Is this for PlayStation (MIPS 1)? I see that https://reviews.llvm.org/D122427 (2022) added some load delay slot support.

https://github.com/llvm/llvm-project/pull/152942