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 r258017, r258429, r258748, r258817:

Merge updates from FSF pre4.3 GCC inspired on Apple's gcc:

Updates to libiberty and mangling.
New align attribute.
Merge Apple updates to libstdc++.

MFC r252387:

Make libsupc++'s __cxa_call_terminate() prototype consistent with the
definition.

Submitted by: dt71@gmx.com

MFC r241957:

Fix several clang warnings in libstdc++, which were exposed by the
recent atf import. These changes are purely cosmetic, no functional
change.

MFC r241959:

Fix a number of other clang warnings in libstdc++, which could appear
when building other C++ software with it. Also fix one actual bug in
libsupc++, which was exposed by such a warning. This latter fix is the
only functional change.

MFC r241960:

For building GNU libstdc++ and libsupc++, filter out libc++-specific and
-std= flags above c++98 or gnu++98 from CXXFLAGS *after* including
bsd.lib.mk, otherwise some additions to CXXFLAGS done in bsd.*.mk might
not be preserved.

MFC: r228780

Update libstdc++ with small changes up to the latest rev. (135556)
from the gcc 4.2 branch.
The libraries in the gcc-4_2-branch remained under the LGPLv2.

Reviewed by: mm
Approved by: jhb (mentor)

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

Approved by: re (implicit)

This commit was generated by cvs2svn to compensate for changes in r171827,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r169691,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r146897,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r132720,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r122182,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r117397,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r110614,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r102782,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r97403,
which included commits to RCS files with non-trunk default branches.