[clang] [clang][bytecode] Don't start record field lifetime by default (PR #193496)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

It feels like it is worth it to note performance changes in commit summaries. It leaves something for folks to look for or FIXME comments or both. If it was worth you spending extra time looking into while you did the work then it is worth putting it into the summary.

https://github.com/llvm/llvm-project/pull/193496