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[flang][openacc] Add clause validaty tests for data construct + fix default…

Authored by clementval on Dec 4 2020, 12:12 PM.

Description

[flang][openacc] Add clause validaty tests for data construct + fix default restriction

Add clause validity tests for the data construct. The default clause can appear only once
and this was not enforce in the ACC.td.

Reviewed By: sameeranjoshi

Differential Revision: https://reviews.llvm.org/D91888