[llvm] [llvm-profgen] Add an option to force marking the profile as preinlined (PR #156501)

[via llvm-commits]

WenleiHe wrote:

> IIRC, csspgo-preinliner is only available in CS mode: https://github.com/llvm/llvm-project/blob/main/llvm/tools/llvm-profgen/ProfileGenerator.cpp#L1109C7-L1115, so we don't run/have this for `-ignore-stack-samples`. For my previous experiments, I always use the `-ignore-stack-samples` mode because it consumes significantly less memory and running time.

Ok.. that explains it. In this case the change looks good. Good fine, thanks!

https://github.com/llvm/llvm-project/pull/156501