[PATCH] fix #69405 - [6 Regression] ICE in c_tree_printer on an invalid __atomic_fetch_add

[Martin Sebor]

The attached patch avoids printing a diagnostic referencing the type
of an incompatible argument to the __atomic_xxx built-ins when the
argument is in error.  Doing otherwise causes an ICE as pointed out
in the bug, for both of which I am to blame.

Martin
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