https://github.com/krzysz00 commented:

1. Can we get a bit more PR description? Maybe examples of where you'd be using 
this?
2. If you're going to have a bit that fiddles with instruction behavior like 
that, either just make that a separate immarg (probably the cleanest way to do 
it) or shove it somewhere like bit 31. Consider the possibility of more banks.
3. ... goodness having this weird little hint that doesn't propagate facts 
about the value is going to lead to a stack of missed optimizations. Are we 
*sure* we need this?

https://github.com/llvm/llvm-project/pull/227953
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