[CMake] Suppress -Wpass-failed warning (#160472)
libstdc++15 makes use of an unroll pragma inside std::find_if(). This
produces a warning if clang fails to unroll the loop. As this pragma is
outside of our control, suppress the warning. Missed transforms are not
something we care about in this context.
Related to https://github.com/llvm/llvm-project/issues/157666.
