[PATCH] wrap long tree chains in a list to avoid attribute error (PR 97413)

[Martin Sebor]

The attribute access implicitly added to function declarations
with VLA parameters includes the top-level VLA bounds chained
together similarly to other attribute arguments.  However,
since attribute access is limited to at most 3 arguments
including the mode, a function that takes three or more VLA
arguments triggers an error from decl_attributes complaining
about excess arguments.

The attached patch gets around it by wrapping the VLA bound
chain in a list.  It doesn't feel like the most elegant solution
but it's simple and  I couldn't think of anything better.  If no
one comes up with a suggestion for a better way of dealing with
this I'll commit the fix sometime tomorrow as obvious.

Martin

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