[llvm-commits] [pr12979][patch/rfc] Clear nsw/nuw in gvn

[Rafael Espíndola]

> The patch is incomplete since I am not sure what is the best thing to
> do about the metadata.

I have implemented the following

* Keep the most generic tbaa, i.e., the one closest to the root.
* Keep the most generic fpmath, i.e., the one with the smallest value.
* Keep the dbg and prof of the value we are replacing.
* Drop metadata we know nothing about.

Cheers,
Rafael
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