[OpenMP] Refactor const restriction for reductions

As discussed in D56113, this patch refactors the implementation of the
const restriction for reductions to reuse a function introduced by
D56113.  A side effect is that diagnostics sometimes now say
"variable" instead of "list item" when a list item is a variable.

Reviewed By: ABataev

Differential Revision: https://reviews.llvm.org/D56298

llvm-svn: 350440
34 files changed
tree: 976d21d2b853b7fde0517f0cb466d41839372145
  1. clang/
  2. clang-tools-extra/
  3. compiler-rt/
  4. debuginfo-tests/
  5. libclc/
  6. libcxx/
  7. libcxxabi/
  8. libunwind/
  9. lld/
  10. lldb/
  11. llgo/
  12. llvm/
  13. openmp/
  14. parallel-libs/
  15. polly/
  16. pstl/
  17. README.md
README.md

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