[clang] [clang] Ignore GCC 11 `[[malloc(x)]]` attribute (PR #68059)

[Timm Baeder via cfe-commits]

================
@@ -4122,6 +4122,9 @@ def RestrictDocs : Documentation {
 The ``malloc`` attribute indicates that the function acts like a system memory
 allocation function, returning a pointer to allocated storage disjoint from the
 storage for any other object accessible to the caller.
+
+The form of ``malloc`` with one or two arguments (supported by GCC 11) is
+currently ignored by Clang.
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tbaederr wrote:

Is it really ignored or is it just treated as if it had no arguments?

https://github.com/llvm/llvm-project/pull/68059