llvm-project

8cc4c6d7 - [flang][Lower] Make reduction processing failure a hard error (#150233)

[flang][Lower] Make reduction processing failure a hard error (#150233) See #150178 This may regress some test cases which only ever passed by accident. I've tested SPEC2017 and a sample of applications to check that this doesn't break anything too obvious. Presumably this was not a widely used feature or we would have noticed the bug sooner. I'm unsure whether this should be backported to LLVM 21 or not: I think it is much better to refuse to compile than to silently produce the wrong result, but there is a chance this could regress something which previously worked by accident. Opinions welcome.