[clang] [llvm] [AArch64] Implement the atomic store with hint intrinsic (PR #198316)

[Nikita Popov via llvm-commits]

nikic wrote:

This seems to have some compile-time impact at -O0: https://llvm-compile-time-tracker.com/compare.php?from=2ac696e23ca31d68a89060c7a935c75bc4efb846&to=34f5f2c594111e6a3edf65673c3ea2849e96e2cb&stat=instructions:u From a quick glance over the diff it's not super obvious what would cause it.

cc @c-rhodes 

https://github.com/llvm/llvm-project/pull/198316