[clang] [Clang][HIP] Deprecate __hip_atomic_* builtins (PR #189897)

[Sameer Sahasrabuddhe via cfe-commits]

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@@ -4565,6 +4565,91 @@ ExprResult Sema::AtomicOpsOverloaded(ExprResult TheCallResult,
                          Op);
 }
 
+/// Deprecate __hip_atomic_* builtins in favour of __scoped_atomic_*
+/// equivalents. Provide a fixit when the scope is a compile-time constant and
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ssahasra wrote:

That's possible if there is a way to generate fixits in the preprocessor. If not, we can still do this by first moving `__HIP` macros to an enum in the HIP headers. That's a much easier change than what I previously tried with the Clang builtin scopes.

https://github.com/llvm/llvm-project/pull/189897