[llvm] InstrProfiling: Split creating Bias offset to getOrCreateBiasVar(Name). NFC. (PR #95692)

[Ellis Hoag via llvm-commits]

ellishg wrote:

> This is a preparation for bitmap bias.

It seems that you have a few related refactorings before your main change. One unfortunate drawback of not having stacked diffs on github is that we cannot see how patches are dependent on each other. I would recommend commenting with dependent PRs to allow folks to get more context into these changes. It also helps users find dependent patches to pick if they need to do so.

https://github.com/llvm/llvm-project/pull/95692