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ACPI_IVAR_HANDLE is the only true "global" IVAR that can be used across multiple bus drivers. The other IVARs are private to direct children of acpi0. However, they need to be numbered after ISA IVARs as ACPI mimics an ISA bus device. To ensure this remains true, add an ISA_IVAR_LAST to use in assert that the private ACPI IVARs do not overlap with ISA IVARs. Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D55354