[PATCH 2/5] OpenMP: Allow complete replacement of clause during map/to/from expansion

At present, map/to/from clauses on OpenMP "target" directives may be expanded into several mapping nodes if they describe array sections with pointer or reference bases, or similar. This patch allows the original clause to be replaced during that expansion, mostly by passing the list pointer to th

[PATCH 2/5] OpenMP: Allow complete replacement of clause during map/to/from expansion

At present, map/to/from clauses on OpenMP "target" directives may be expanded into several mapping nodes if they describe array sections with pointer or reference bases, or similar. This patch allows the original clause to be replaced during that expansion, mostly by passing the list pointer to th