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[flang] [OpenMP 4.5] Adding lit test cases for OpenMP Constructs.

Authored by praveen on Sep 24 2020, 5:08 AM.

Description

[flang] [OpenMP 4.5] Adding lit test cases for OpenMP Constructs.
    1. Section 2.5 : Parallel Construct
    2. Section 2.7.1 : Loop Construct
    3. Section 2.7.2 : Sections Construct
    4. Section 2.7.3 : Single Construct
    5. Section 2.7.4 : Workshare Construct
    6. Section 2.8.1 : Simd Construct
    7. Section 2.8.3 : Loop Simd Construct
    8. Section 2.9.1 : Task Construct
    9. Section 2.9.2 : Taskloop Construct
  1. Section 2.9.3 : Taskloop Simd Construct

Most of the test cases added as part of this change contains semantic errors except few cases which are semantically correct but thrown a semantic error.

Currently flang is not throwing the errors for these cases and throwing semantic errors for the following correct test cases

{omp-do03.f90 , omp-loop-simd01.f90 , omp-simd02.f90 , omp-taskloop01.f90}

Hence, all the test cases are marked as XFAIL.

Reviewed By: DavidTruby

Differential Revision: https://reviews.llvm.org/D87908