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

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

This change would also end up impacting the `num_repetitions` field in the yaml input/output. I have it currently setup to accept both `min_instructions` and `num_repetitions` to preserve backwards compatibility. I'm assuming at some point we'll want to deprecate this old option? I've seen #38430 but it doesn't seem like there was a resolution there, so I'm unsure of the procedure here for changing the yaml schema.

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