[llvm] IR: Add attribute negated (PR #121027)

[YunQiang Su via llvm-commits]

wzssyqa wrote:

> > Is `operand bundles` for this purpose?
> 
> Mostly not. Bundles also aren't associated with a specific operation, but for this type of usage they would have similar usability issues as attributes (adding a new side channel every user of the operation would have to consider)

Thanks. Any idea of such cases?
In fact I am also considering something like `fmaxa/fmina` (Absolute value).

https://github.com/llvm/llvm-project/pull/121027