[llvm] [SelectionDAG][ARM] Propagate fast math flags in visitBRCOND (PR #156647)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

This looks like it might need a format, and was there one of the tests this should update? llvm/test/CodeGen/ARM/fpcmp-opt.ll maybe? LGTM otherwise.

https://github.com/llvm/llvm-project/pull/156647