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Similar to #135415. The spec has not strict restriction to allow a single `if_present` clause on the host_data and update directives. Allowing this clause multiple times does not change the semantic of it. This patch relax the rules in ACC.td since there is no restriction in the standard. The OpenACC dialect represents the `if_present` clause with a `UnitAttr` so the attribute will be set if the is one or more `if_present` clause.
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