Add the `CrayClang` compiler ID to the list of OpenMP flag candidates and
ensure the flags are propagated to the link step to trigger the Cray OpenMP
offload linker (`cce_omp_offload_linker`) wrapper.
Fixes: #24402, #24962
Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`. Use `clang-format` version 6.0.
* If you reached this commit for a line in `git blame`, re-run the blame
operation starting at the parent of this commit to see older history
for the content.
* See the parent commit for instructions to rebase a change across this
style transition commit.
