[compiler-rt] [llvm] [X86][BF16] Add libcall for F80 -> BF16 (PR #109116)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

> If GCC already has the method people will eventually end up linking with libgcc and run into calling convention differences. Why are they different?

Sorry, I mixed up. We have the same behavior with GCC. GCC supports it since 13.1 https://godbolt.org/z/dnhaeGvf7

https://github.com/llvm/llvm-project/pull/109116