MFC r275533:

Sync with Illumos.  This have no effect to FreeBSD.

Illumos issue:
    5100 sparc build failed after 5004

MFC after:	2 weeks


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275560 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
MFV r275534:

Sync with Illumos.  This have no effect to FreeBSD.

Illumos issue:
    5285 pass in cpu_pause_func via pause_cpus

MFC after:	2 weeks


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275561 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f