[flang][OpenMP] Map `teams loop` to `teams distribute` when required. (#127489) This extends support for generic `loop` rewriting by: 1. Preventing nesting multiple worksharing loops inside each other. This is checked by walking the `teams loop` region searching for any `loop` directive whose `bind` modifier is `parallel`. 2. Preventing convert to worksharing loop if calls to unknow functions are found in the `loop` directive's body. We walk the `teams loop` body to identify either of the above 2 conditions, if either of them is found to be true, we map the `loop` directive to `distribute`.
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