[PATCH] avoid using strnlen result for late calls to strlen (PR 82604)

[Martin Sebor]

While looking into opportunities to detect strnlen/strlen coding
mistakes (pr86199) I noticed a bug in the strnlen implementation
I committed earlier today that lets a strnlen() result be saved
and used in subsequent calls to strlen() with the same argument.
The attached patch changes the handle_builtin_strlen() function
to discard the strnlen() result unless its bound is greater than
the length of the string.

Martin
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