This patch adds the basic JIT support for OpenMP. Currently it only works on Nvidia GPUs.
The support for AMDGPU can be extended easily by just implementing three interface functions. However, the infrastructure requires a small extra extension (add a pre process hook) to support portability for AMDGPU because the AMDGPU backend reads target features of functions. 02bc7effcc (diff-321c2038035972ad4994ff9d85b29950ba72c08a79891db5048b8f5d46915314R432) shows how it roughly works.
As for the test, even though I added the corresponding code in CMake files, the test still cannot be triggered because some code is missing in the new plugin CMake file, which has nothing to do with this patch. It will be fixed later.
In order to enable JIT mode, when compiling, `-foffload-lto` is needed, and when linking, `-foffload-lto -Wl,--embed-bitcode` is needed. That implies that, LTO is required to enable JIT mode.
Reviewed By: jdoerfert
Differential Revision: https://reviews.llvm.org/D139287
5a3a527f8a