[clang] Add clang atomic control options and attribute (PR #114841)

[Aaron Ballman via cfe-commits]

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@@ -3292,6 +3292,8 @@ def err_invalid_branch_protection_spec : Error<
   "invalid or misplaced branch protection specification '%0'">;
 def warn_unsupported_branch_protection_spec : Warning<
   "unsupported branch protection specification '%0'">, InGroup<BranchProtection>;
+def err_attribute_invalid_atomic_argument : Error<
+  "invalid argument '%0' to atomic attribute; valid options are: 'no_remote_memory', 'no_fine_grained_memory', 'ignore_denormal_mode' (optionally prefixed with '!')">;
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AaronBallman wrote:

Please wrap to usual 80-column limits.

https://github.com/llvm/llvm-project/pull/114841