[llvm] Disable f16 atomic hack for llvm 15. (#5756)
[llvm] Disable f16 atomic hack for llvm 15. (#5756)

* [llvm] Disable f16 atomic hack for llvm 15.

Limit TaskCodeGenCUDA::atomic_op_using_cas to llvm 10 build.

* Add comment for llvm15.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Co-authored-by: pre-commit-ci[bot] <3ea08453efb076ca910552532a53973a6527df40@users.noreply.github.com>
yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi