[clang] [llvm] [Clang][OpenMP] Support for dispatch construct (Sema & Codegen) support (PR #131838)

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SunilKuravinakop wrote:

> Hmm, this PR is much shorter than it used to be.

The initial PR where you had given your comments was [117904](https://github.com/llvm/llvm-project/pull/117904) . I had made a push to wrong branch and as such 117904 was closed. I Could not re-open it.  I ended up creating a new PR but, this has all the changes. I have included a pointer to 117904 in the beginning of this PR.

https://github.com/llvm/llvm-project/pull/131838