[llvm] [BOLT] Add CustomOffset flag for optimizing kernel (PR #98153)

[Peter Jung via llvm-commits]

ptr1337 wrote:

@lifengxiang1025 

i face the same issues with that. Somehow, once I was able to get a pretty small profile in around 20 attemps of sampling/profiling for 10 minutes each.
I currently do a test with disabling KASLR and randomize base KCONFIG.

https://github.com/llvm/llvm-project/pull/98153