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

[Clement Courbet via cfe-commits]

legrosbuffle wrote:

> I'm assuming at some point we'll want to deprecate this old option?

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

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