[flang][acc] Add ACCOptimizeFirstprivateMap pass (#178546) This pass optimizes acc.firstprivate_map operations generated during OpenACC recipe materialization when acc.firstprivate is materialized into the mapping and a private allocation inside region. The optimization applies to scalar variables of trivial types (integers, reals, logicals) as long as they are not optional. The pass hoists loads from the firstprivate variable to before the compute region, converting the firstprivate copy to a pass-by-value pattern. This eliminates the need for runtime copying the firstprivate variable since only its value is needed for initializing private copies.
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