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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