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

[Tom Stellard via cfe-commits]

tstellar wrote:

@kmpeng OK, thanks.  I think these errors have been happening to pretty much everyone (including myself), but I haven't seen a double commit yet.  I've filed a ticket with GitHub to try to get them to look at this.  This is a GitHub problem for sure.

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