[clang] [llvm] [clang][OpenMP] Add no-loop SPMD kernel promotion (PR #224041)

[Nicole Aschenbrenner via cfe-commits]

nicebert wrote:

@dhruvachak I added the test cases you asked for (a runtime trip count, a private clause, and a lambda capturing by reference). In the process I restructured the test to group the kernels by whether they get promoted, which should make it easier to read and extend. Since the lambda case needs C++, the test is now target_no_loop.cpp.


https://github.com/llvm/llvm-project/pull/224041