[LLDB][RISCV] Add riscv register enums

According to [RISC-V ISA Spec](https://riscv.org/wp-content/uploads/2017/05/riscv-spec-v2.2.pdf) and [riscv-v-spec](https://github.com/riscv/riscv-v-spec/blob/master/v-spec.adoc#3-vector-extension-programmers-model)

Reviewed By: DavidSpickett

Differential Revision: https://reviews.llvm.org/D130899

GitOrigin-RevId: 768e59d959c7e23e98cda1b08c5b6b68dbc1d2a7
1 file changed