[llvm-branch-commits] [RISCV, test] Replace -riscv-no-aliases with -M no-aliases (PR #134879)

[Fangrui Song via llvm-branch-commits]

https://github.com/MaskRay created https://github.com/llvm/llvm-project/pull/134879

now that llc supports `-M no-aliases` (along with llvm-mc and llvm-objdump).