[lldb] add required for lldb RISCV relocations in MCJIT (#126266)
After implementing CFI instructions in the function prologue, LLDB
testing for RISC-V started failing due to insufficient relocations
(e.g., R_RISCV_SET8, R_RISCV_SET16).
This patch adds support for the necessary RISC-V relocations in MCJIT.