[OMPIRBuilder] Fix gcc -Wparentheses warning [NFC]
Without this gcc warned like
/repo/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp:7559:68: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
7559 | NumStaleCIArgs == (OffloadingArraysToPrivatize.size() + 2) &&
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
7560 | "Wrong number of arguments for StaleCI when shareds are present");
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
