initial merge of GCC 12.3.0.

this doesn't include any of the changes to the .c -> .cc files renamed,
and reverts our local changes to the vax port and libsanitizer subdir.
vax GCC was rewritten and our local fixes no longer are relevant, and
the new libsanitizer is more updated than our old one, and merging via
gcc10->gcc12 is not really possible.

unfortunately, our local changes to libsanitizer that aren't related
to the general update of those sources (ie, the netbsd code) will need
to be re-checked and perhaps re-ported.

Fix a comment

netbsd/hppa uses 16 byte alignment. the inherited default changed..

branches: 1.5.14;
canonicalise the netbsd spec functions in NETBSD_SUBTARGET_EXTRA_SPECS:
netbsd_cpp_spec
netbsd_link_spec
netbsd_entry_point
netbsd_endfile_spec

use this in all netbsd targets.

XXX: 3 ports set this to EXTRA_SPECS instead of SUBTARGET_EXTRA_SPECS.

Remove code for the !TARGET_BIG_SWITCH case

Remove duplicated lines

merge gcc 4.8.2 r206687 (part 3).

branches: 1.1.1; 1.1.2; 1.1.8;
pull across these new files from old gcc. from chuq.

Fix a comment

netbsd/hppa uses 16 byte alignment. the inherited default changed..

branches: 1.5.14;
canonicalise the netbsd spec functions in NETBSD_SUBTARGET_EXTRA_SPECS:
netbsd_cpp_spec
netbsd_link_spec
netbsd_entry_point
netbsd_endfile_spec

use this in all netbsd targets.

XXX: 3 ports set this to EXTRA_SPECS instead of SUBTARGET_EXTRA_SPECS.

Remove code for the !TARGET_BIG_SWITCH case

Remove duplicated lines

merge gcc 4.8.2 r206687 (part 3).

branches: 1.1.1; 1.1.2; 1.1.8;
pull across these new files from old gcc. from chuq.

netbsd/hppa uses 16 byte alignment. the inherited default changed..

canonicalise the netbsd spec functions in NETBSD_SUBTARGET_EXTRA_SPECS:
netbsd_cpp_spec
netbsd_link_spec
netbsd_entry_point
netbsd_endfile_spec

use this in all netbsd targets.

XXX: 3 ports set this to EXTRA_SPECS instead of SUBTARGET_EXTRA_SPECS.

Remove code for the !TARGET_BIG_SWITCH case

Remove duplicated lines

merge gcc 4.8.2 r206687 (part 3).

branches: 1.1.2; 1.1.8;
pull across these new files from old gcc. from chuq.

canonicalise the netbsd spec functions in NETBSD_SUBTARGET_EXTRA_SPECS:
netbsd_cpp_spec
netbsd_link_spec
netbsd_entry_point
netbsd_endfile_spec

use this in all netbsd targets.

XXX: 3 ports set this to EXTRA_SPECS instead of SUBTARGET_EXTRA_SPECS.

Remove code for the !TARGET_BIG_SWITCH case

Remove duplicated lines

merge gcc 4.8.2 r206687 (part 3).

branches: 1.1.2; 1.1.8;
pull across these new files from old gcc. from chuq.

merge gcc 4.8.2 r206687 (part 3).

branches: 1.1.2; 1.1.8;
pull across these new files from old gcc. from chuq.

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs. ("Protocol error: too many arguments")