[llvm] [llvm-exegesis] Skip benchmark entries with unknown opcodes in analysis mode (PR #201162)

[Min-Yih Hsu via llvm-commits]

mshockwave wrote:

I noticed that you're setting your email private in github profile such that the email showed up in the commit ends with `users.noreply.github.com`. LLVM encourages contributors to use an actual email: https://llvm.org/docs/DeveloperPolicy.html#github-email-address

https://github.com/llvm/llvm-project/pull/201162