[flang][Lower] Convert OMP Map and related functions to evaluate::Expr (#81626) The related functions are `gatherDataOperandAddrAndBounds` and `genBoundsOps`. The former is used in OpenACC as well, and it was updated to pass evaluate::Expr instead of parser objects. The difference in the test case comes from unfolded conversions of index expressions, which are explicitly of type integer(kind=8). Delete now unused `findRepeatableClause2` and `findClause2`. Add `AsGenericExpr` that takes std::optional. It already returns optional Expr. Making it accept an optional Expr as input would reduce the number of necessary checks when handling frequent optional values in evaluator. [Clause representation 4/6]
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