[clang] [clang-tools-extra] [llvm] [llvm-exegesis] Replace --num-repetitions with --min-instructions (PR #77153)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> It's a single line of code so it probably can stay there for backwards compatibility :)

Sounds good.

https://github.com/llvm/llvm-project/pull/77153