Slava Zakharin 5230955af7 [flang,acc] Support -ffp-maxmin-behavior option in lowering. (#184730) ...

This patch adds `flang -fc1` option `-ffp-maxmin-behavior` and
propagates it throughout Flang, so that semantics context,
lowering and the pass pipeline builder can use it.

MAX/MIN intrinsic and OpenACC max/min reduction lowering
are now controlled by the option.

I kept the `Legacy` mode, which is the default and matches the current
behavior. I am going to test and merge a follow-up patch that
replaces `Legacy` with `Portable`.

RFC:
https://discourse.llvm.org/t/flang-canonical-and-optimizable-representation-for-min-max/90037

2026-03-06 12:21:58 -08:00

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