MFC r320546

MFC r320546
  When "force" is specified to pmap_invalidate_cache_range(), the given
  start address is not required to be page aligned.  However, the loop
  within pmap_invalidate_cache_range() that performs the actual cache
  line invalidations requires that the starting address be truncated to
  a multiple of the cache line size.  This change corrects an error in
  that truncation.

git-svn-id: svn://svn.freebsd.org/base/stable/10@321363 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f