[clang] [Clang] Permit floating point values in atomic_*_n operations (PR #183843)

[Erich Keane via cfe-commits]

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@@ -4894,10 +4894,14 @@ ExprResult Sema::BuildAtomicExpr(SourceRange CallRange, SourceRange ExprRange,
                             diag::err_incomplete_type)) {
       return ExprError();
     }
-  } else if (IsN && !ValType->isIntegerType() && !ValType->isPointerType()) {
+  } else if (IsN && !ValType->isIntegerType() && !ValType->isPointerType() &&
+             !(ValType->isFloatingType() &&
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erichkeane wrote:

Can you dig through git a bit?  Maybe the answer is there? My suspicion is it was just a 'we forgot' and someone was doing 1 but not the other, but I don't have a good idea.

https://github.com/llvm/llvm-project/pull/183843