[flang] Add initial support for RegionBranchOpInterface to AA (#196132) This PR introduces initial support for being able to disambiguate values through operations that implement RegionBranchOpInterface (eg fir.if). The initial approach implements a localized approach which instead of an invasive update to the current algorithm so that a single underlying origin to be replaced with multiple, it still leaves the single origin concept. It does so through a conservative merge of all input sources. The main initial goal is to allow disambiguating OPTIONAL pattern where we have an allocate on one branch and an absent on the other. Additionally, it is able to properly merge sources if the sources have same properties.
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