[clang] [llvm] [Matrix] Implement matrix support for the `select` intrinsic (PR #227753)

[Kaitlin Peng via llvm-commits]

kmpeng wrote:

@tstellar Ah sorry about that, I was having trouble merging it for a while. I didn't see an error message when the merge finally went through, but I saw many different error messages while I was trying. The ones I remember are 502 bad gateway, unable to read response from server, merge already in progress, and merge blocked due to rule violation errors.

https://github.com/llvm/llvm-project/pull/227753