MFV r275548:

Verify that the block pointer is structurally valid, before attempting to
read it in.  It can only be invalid in the case of a ZFS bug, but this
change will help identify such bugs in a more transparent way, by
panic'ing with a relevant message, rather than indexing off the end of an
array or something.

Illumos issue:
    5349 verify that block pointer is plausible before reading

MFC after:	2 weeks


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275740 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f