[PATCH] D126323: [OpenMP] Extend omp teams to permit nested omp atomic

[Joel E. Denny via Phabricator via cfe-commits]

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OpenMP 5.2, sec. 10.2 "teams Construct", p. 232, L9-12 restricts what
regions can be strictly nested within a `teams` construct.  This patch
relaxes Clang's enforcement of this restriction in the case of nested
`atomic` constructs unless `-fno-openmp-extensions` is specified.
Cases like the following then seem to work fine with no additional
implementation changes:

  #pragma omp target teams map(tofrom:x)
  #pragma omp atomic update
  x++;


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126323

Files:
  clang/lib/Sema/SemaOpenMP.cpp
  clang/test/OpenMP/nesting_of_regions.cpp
  openmp/libomptarget/test/offloading/target-teams-atomic.c
  openmp/runtime/test/teams/teams-atomic.c

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