MFC 297931,298022

MFC 297931,298022

297931
    Expose doreti as a global symbol on amd64 and i386.

    doreti provides the common code path for returning from interrupt
    andlers on x86.  Exposing doreti as a global symbol allows kernel
    modules to include low-level interrupt handlers instead of requiring
    all low-level handlers to be statically compiled into the kernel.

    Submitted by:       Howard Su <howard0su@gmail.com>
    Reviewed by:        kib

298022
    hyperv: Deprecate HYPERV option by moving Hyper-V IDT vector into vmbus

    Submitted by:       Jun Su <junsu microsoft com>
    Reviewed by:        jhb, kib, sephe
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D5910

git-svn-id: svn://svn.freebsd.org/base/stable/10@302041 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f