[llvm] [Support] Refactor getN1Bits so it does not work around any g++ bug (PR #78933)

[Philip Reames via llvm-commits]

preames wrote:

> @AtariDreams It doesn't appear like this PR (or #87560, #87313, #85162, or #91386) have been approved by a reviewer? The LLVM review policy technically does allow post-commit review, but that is typically de-facto reserved for code owners working in their specific area. These PRs should probably be reverted until they are adequately reviewed.

I want to state this far more strongly.  Landing PRs without appropriate review is a significant violation of the review policy and our developer practices.  This is wildly inappropriate, and if continued would be a reason for revoking commit rights entirely.  

In your case, please err strongly towards waiting on review.  Only commit without pre-review if you have established trust with contributors in a given area.  As an observer, it seems clear you have lost any trust you may have built, so please do *not* land a change without pre review at all for near future.  

https://github.com/llvm/llvm-project/pull/78933