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 rr258501, r258507;
gcc: Bring updates from Google's enhanced gcc-4.2.1.

Google released and enhanced version of gcc-4.2.1 plus their local
patches for Android[1].

The patches are owned by Google and the license hasn't been changed
from the original GPLv2. We are only bringing a subset of the
available patches that may be helpful in FreeBSD, in other words,
changes specific to android are not included.

From the README.google file[1].

Patches applied to google_vendor_src_branch/gcc/gcc-4.2.1:

gcc/Makefile.in
gcc/c-common.c
gcc/c-common.h
gcc/c-opts.c
gcc/c-typeck.c
gcc/cp/typeck.c
gcc/doc/invoke.texi
gcc/flags.h
gcc/opts.c
gcc/tree-flow.h
gcc/tree-ssa-alias-warnings.c
gcc/tree-ssa-alias.c

Backport of -Wstrict-aliasing from mainline.
Silvius Rus <rus@google.com>

gcc/coverage.c:
Patch coverage_checksum_string for PR 25351.
Seongbae Park <spark@google.com>
Not yet submitted to FSF.

gcc/c-opts.c
gcc/c-ppoutput.c
gcc/c.opt
gcc/doc/cppopts.texi
libcpp/Makefile.in
libcpp/directives-only.c
libcpp/directives.c
libcpp/files.c
libcpp/include/cpplib.h
libcpp/init.c
libcpp/internal.h
libcpp/macro.c
Support for -fdirectives-only.
Ollie Wild <aaw@google.com>.
Submitted to FSF but not yet approved.

libstdc++-v3/include/ext/hashtable.h
http://b/742065
http://b/629994
Reduce min size of hashtable for hash_map, hash_set from 53 to 5

libstdc++-v3/include/ext/hashtable.h
http://b/629994
Do not iterate over buckets if hashtable is empty.

gcc/common.opt
gcc/doc/invoke.texi
gcc/flags.h
gcc/gimplify.c
gcc/opts.c
Add Saito's patch for -finstrument-functions-exclude-* options.

gcc/common.opt
gcc/doc/invoke.texi
gcc/final.c
gcc/flags.h
gcc/opts.c
gcc/testsuite/gcc.dg/Wframe-larger-than.c
Add a new flag -Wframe-larger-than- which enables a new warning
when a frame size of a function is larger than specified.
This patch hasn't been integrated into gcc mainline yet.

gcc/tree-vrp.c
Add a hack to avoid using ivopts information for pointers starting
at constant values.

Reference:

[1]
https://android.googlesource.com/toolchain/gcc/+/master/gcc-4.2.1/

Obtained from: Google Inc.

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)

FreeBSD uses unchanged versions of this files.

Use stock GCC versions on these files.

FreeBSD uses stock versions of these GCC files.

Use pure stock files.

Use the stock 3.2.1-prerelease file.

Approved by: obrien

Use the stock 3.1 prerelease version of this for now.

Use the stock 3.1-snap file now.
Until we can figure out how to reimpliment our custom format warnings
since the FSF developers totally revamped them, and took away the hooks
we were using to accomplish our desires.

Merge our changes - this brings rev 1.2 (-fformat-extensions)
into GCC 2.95.1.

Fix conflicts.
This brings rev 1.2 (-fformat-extensions) into EGCS 1.1.2.

Support printf format checking of FreeBSD kernel formats %[Dbrz].
This is enabled by the undocumented option -fformat-extensions.
This option should be named better and/or give more control over
the extensions.

Fixed a message - don't warn about the field width when it's the
precision that has the wrong type. Didn't fix excessive checking
for the precision relative to the type - ANSI requires both to be
ints, but gcc permits the field width to be either int or unsigned
int.

This commit was generated by cvs2svn to compensate for changes in r18334,
which included commits to RCS files with non-trunk default branches.

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.