[llvm] [ConstantFold][RFC] Add AllowLHSConstant parameter in getBinOpAbsorber (PR #109736)

[via llvm-commits]

eric-xtang1008 wrote:

> > LGTM
> 
> When landing, please make sure to remember to update the cover message. The actual commit message is fine, but the cover message is actively misleading and should not be used for the commit message (as per github's default.)

I changed the cover message to "Add AllowLHSConstant parameter in getBinOpAbsorber function", does it make sense?

https://github.com/llvm/llvm-project/pull/109736