llvm

9555a737 - Address more clang & clang-tidy warnings.

Address more clang & clang-tidy warnings. * Add more const where we can. * Use contains() rather than count() to check for existence. * Stop looking up options through llvm::cl::getRegisteredOptions() when we can use their corresponding variables instead. * Stop creating unused .blend PHI nodes. * Enforce W^X in our loader. * Use remove_if() rather than stable_partition() to remove released semaphores. * Ensure driver::CompilerInfo is always initialized.