[flang][openmp] Use common Directive and Clause enum from llvm/Frontend

Summary:
This patch is removing the custom enumeration for OpenMP Directives and Clauses and replace them
with the newly table

[flang][openmp] Use common Directive and Clause enum from llvm/Frontend

Summary:
This patch is removing the custom enumeration for OpenMP Directives and Clauses and replace them
with the newly tablegen generated one from llvm/Frontend. This is a first patch and some will follow to share the same
infrastructure where possible. The next patch should use the clauses allowance defined in the tablegen file.

Reviewers: jdoerfert, DavidTruby, sscalpone, kiranchandramohan, ichoyjx

Reviewed By: DavidTruby, ichoyjx

Subscribers: ichoyjx, mgorny, yaxunl, guansong, jfb, sstefan1, aaron.ballman, llvm-commits

Tags: #llvm, #flang

Differential Revision: https://reviews.llvm.org/D82906

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Temporarily Revert "[flang][OpenMP] Enhance parser support for flush construct to OpenMP 5.0"
as it's failing Semantics/omp-clause-validity01.f90.

This reverts commit b32401464f4c9c9d43a3ddcb351cb6c

Temporarily Revert "[flang][OpenMP] Enhance parser support for flush construct to OpenMP 5.0"
as it's failing Semantics/omp-clause-validity01.f90.

This reverts commit b32401464f4c9c9d43a3ddcb351cb6c7c713fdb4.

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[flang][OpenMP] Enhance parser support for flush construct to OpenMP 5.0

Summary:
This patch enhances parser support for flush construct to OpenMP 5.0 by including memory-order-clause.

2.18.8 flush

[flang][OpenMP] Enhance parser support for flush construct to OpenMP 5.0

Summary:
This patch enhances parser support for flush construct to OpenMP 5.0 by including memory-order-clause.

2.18.8 flush Construct
!$omp flush [memory-order-clause] [(list)]
where memory-order-clause is
acq_rel
release
acquire

The patch includes code changes and testcase modifications.

Reviewed By: klausler, kiranchandramohan

Differential Revision: https://reviews.llvm.org/D82177

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[flang] Reformat with latest clang-format and .clang-format

Original-commit: flang-compiler/f18@9fe84f45d7fd685051004678d6b5775dcc4c6f8f
Reviewed-on: https://github.com/flang-compiler/f18/pull/1094

[flang] [LLVMify F18] Compiler module folders should have capitalised names (flang-compiler/f18#980)

This patch renames the modules in f18 to use a capital letter in the
module name

Signed-off-b

[flang] [LLVMify F18] Compiler module folders should have capitalised names (flang-compiler/f18#980)

This patch renames the modules in f18 to use a capital letter in the
module name

Signed-off-by: Caroline Concatto <caroline.concatto@arm.com>

Original-commit: flang-compiler/f18@d2eb7a1c443d1539ef12b6f027074a0eb15b1ea0
Reviewed-on: https://github.com/flang-compiler/f18/pull/980

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