[llvm-branch-commits] [flang] [Flang][OMP] Replace SUM intrinsic call with SUM operations (PR #113082)

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NimishMishra wrote:

Thanks for the inputs @tblah. 

>> Having it in a runtime library would make it easier for vendors to swap out their own implementations e.g. maybe somebody already has a great MATMUL for AMD GPUs and wants flang to use that, but the implementation is useless on a CPU

How do we convergence on the definition of these runtime functions when we introduce a library? Is it usually through a RFC? Because if we think of vendors swapping implementations, does there need to be a consensus prior to the implementation?

https://github.com/llvm/llvm-project/pull/113082