[llvm] [BOLT][NFC] Add allocator id to createInstrIncMemory (PR #68709)

[Rafael Auler via llvm-commits]

rafaelauler wrote:

At the time I tought it would be good to have it ready to run in parallel because I couldn't tell how expensive it would be to run the instrumentation pass. But eventually I realized I had little gains from running this in parallel so I just turned it off, but kept the scaffolding for parallel execution "just in case" we need to revisit this. I know realize this was silly, and we can just take that off.

https://github.com/llvm/llvm-project/pull/68709