[flang][OpenMP] Parse OpenMP 6.0 map modifiers (#149134) OpenMP 6.0 has changed the modifiers on the MAP clause: - map-type-modifier has been split into individual modifiers, - map-type "delete" has become a modifier, - new modifiers have been added. This patch adds parsing support for all of the OpenMP 6.0 modifiers. The old "map-type-modifier" is retained, but is no longer created in parsing. It will remain to take advantage of the preexisting modifier validation for older versions: when the OpenMP version is < 6.0, the modifiers will be rewritten back as map-type-modifiers (or map- type in case of "delete"). In this patch the modifiers will always be rewritten in the older format to isolate these changes to parsing as much as possible.
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