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 r260014, r260099:

gcc: Add support for label attributes and "unavailable" attribute.

Apple GCC has extensions to support for both label attributes and
an "unavailable" attribute. These are critical for objc but are
also useful in regular C/C++.

Obtained from: Apple GCC 4.2 - 5531

MFC r258081, r258138, r258143, r258179, r258157, r258204, 258205,
r258206, r258207, r258321

This is a series of commits inspired on Google's gcc-4.2.1 for
Android that were taken from the gcc pre-4.3 under the GPLv2.

gcc: Backport fixes for -W parentheses in C++
This fixes GCC 19564.
gcc: merge rs6000 change from FSF pre-gcc43
Don't set MASK_PPC_GFXOPT for 8540 or 8548.
Merge vrp-tree fix from gcc-4.3
Fix missed conversion from / to >> (GCC PR32521)
Merge in GCCr120505 to include definition of TREE_OVERFLOW_P
gcc: warn about integer overflow in constant expressions in the C++ frontend.
gcc: Add a new option -Wvla to warn variable length array.
libcpp: preprocessor speedup patches from upstream gcc.
gcc: add femit-struct-debug support to reduce Reduce dwarf debug size
gcc: Fix postreload-gcse treatment of call-clobbered registers.
gcc: Record some previous commits in the ChangeLog.gcc43 file.

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

Approved by: re (implicit)

Upgrade of base gcc and libstdc++ to the last GPLv2-licensed revision
(rev. 127959 of gcc-4_2-branch).

Resolved GCC bugs:
c++: 17763, 29365, 30535, 30917, 31337, 31941, 32108, 32112, 32346,
32898, 32992
debug: 32610, 32914
libstdc++: 33084, 33128
middle-end: 32563
rtl-optimization: 33148
tree-optimization: 25413, 32723
target: 32218

Tested by: pointyhat (miwi)
Obtained from: gcc (gcc-4_2-branch up to rev. 127959)
PR: gnu/153298, gnu/153959, gnu/154385
MFC after: 1 month

This commit was generated by cvs2svn to compensate for changes in r171825,
which included commits to RCS files with non-trunk default branches.

GCC 4.2.1 release.

GCC 4.2.0 release.

Gcc 3.4.6 as of 2006/08/25 #116475.

Gcc 3.4.4 release.

Gcc 3.4.2 20040728.

Gcc 3.3.3 20031106.

Gcc 3.3.1-release.

Gcc 3.3.1-pre as of 2003-07-11.

Gcc 3.2.2-release.

Gcc 3.2.1 release virgin vendor import. (19-Nov-2002)

Gcc 3.2.1-prerelease from the FSF anoncvs repo gcc-3_2-branch on October 9th 2002 20:15 EST.

Gcc 3.2.1-prerelease from the FSF anoncvs repo gcc-3_2-branch on 1-Sep-2002 00:00:01 EDT.

Gcc 3.1.0 pre-release from the FSF anoncvs repo on 9-May-2002 15:57:15 EDT.

Enlist the FreeBSD-CURRENT users as testers of what is to become Gcc 3.1.0.
These bits are taken from the FSF anoncvs repo on 1-Feb-2002 08:20 PST.

Bring in bug fixes from the GCC anoncvs server's "gcc-2_95-branch"
branch as of May 26th, 2000. [these are changes March 31 - May 24th]

Virgin import of the GCC 2.95.2 compilers

Virgin import of the GCC 2.95.1 compilers

Virgin import of gcc from EGCS 1.1.2

Import of unmodified (but trimmed) gcc-2.7.2. The bigger parts of the
non-i386, non-unix, and generatable files have been trimmed, but can easily
be added in later if needed.

gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's
handy to have both available for reference for such little cost.

The freebsd-specific changes will then be committed, and once the dust has
settled, the bmakefiles will be committed to use this code.