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[flang][openacc] Add clause validity tests for the update directive

Authored by clementval on Dec 4 2020, 11:38 AM.

Description

[flang][openacc] Add clause validity tests for the update directive

Add couple of clause validity tests for the update directive and check for
the restriction where at least self, host or device clause must appear on the directive.

Reviewed By: sameeranjoshi

Differential Revision: https://reviews.llvm.org/D92447