[clang][p2719] Module deserialization does not restore allocator flags (#137102)

When serializing and deserializing a FunctionDecl we don't recover
whether or not the decl was a type aware allocator or destroying delete,
because in the final PR that information was placed in a side table in
ASTContext.

In principle it should be possible to re-do the semantic checks to
determine what these flags should be when deserializing, but it seems
like the most robust path is simply recording the flags directly in the
serialized AST.

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