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[flang][openmp] Separate memory-order-clause parser creating OmpClause node

Authored by clementval on Sat, Nov 21, 11:31 AM.

Description

[flang][openmp] Separate memory-order-clause parser creating OmpClause node

This patch introduce the separate parser for the memory-order-clause from the general
OmpClauseList. This parser still creates OmpClause node and therefore can use all the feature
from TableGen and the OmpStructureChecker.
This is applied only for the Flush construct in this patch and it should be applied for
atomic as well.

This is the approach we disscussed several time during the weekly call.

Reviewed By: kiranchandramohan, sameeranjoshi

Differential Revision: https://reviews.llvm.org/D91839

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