[ACTIVITY] Report for week #35

Hello,

# [GNU-767] Support changing SVE vector length in remote debugging

- Resumed working on new approach to support changing SVE vector length in remote debugging. I was able to use DWARF location expressions in the target description to express the SVE vector register sizes in terms of the VG register. Also adapted the regcache to support variable-length registers, and removed the VQ value from the target description and from aarch64_gdbarch_tdep, making GDB use one target description regardless of the vector length size. Still ironing out some bugs, and haven't tackled gdbserver yet.