Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r247960:

Make ctfconvert work correctly on clang-compiled object files. Clang
puts the full original source filename in the STT_FILE entry of the ELF
symbol table, while gcc saves only the basename.

Since the DWARF DW_AT_name attribute contains the full source filename,
both for clang and gcc, ctfconvert takes just the basename of it, for
matching with the STT_FILE entry. So when attempting to match with such
an entry, use its basename, if necessary.

Reported by: avg

MFC r247962:

Fix error in r247960: actually assign the basename to match.iim_file.

Pointed out by: avg
Pointy hat to: dim

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Catch up with r210324. d_buf will be NULL for SHT_NOBITS sections, do not
attempt to copy from it in that case.

MFC after: 1 month

A lot of changes to make this code compile cleanly on FreeBSD.

This commit was generated by cvs2svn to compensate for changes in r178528,
which included commits to RCS files with non-trunk default branches.

Vendor import of the full userland contrib part of DTrace support from
OpenSolaris. This commit resets files to match the versions in the
OpenSolaris tree as of 2008/04/10.

The changes in this import from the previous import are the ones that
will subsequently re-applied to take files off the vendor branch. This
is unfortunately necessary because the Solaris developers won't allow
FreeBSD support #ifdefs in their source code because that creates
'dead code' (stuff that they never compile).

Vendor import of the CTF (Compact C Type Format) code used by DTrace
from OpenSolaris.