Remove tilegx port.

Since tile support has been removed from the Linux kernel for 4.17,
this patch removes the (unmaintained) port to tilegx from glibc (the
tilepro support having been previously removed).  This reflects the
general principle that a glibc port needs upstream support for the
architecture in all the components it build-depends on (so binutils,
GCC and the Linux kernel, for the normal case of a port supporting the
Linux kernel but no other OS), in order to be maintainable.

Apart from removal of sysdeps/tile and sysdeps/unix/sysv/linux/tile,
there are updates to various comments referencing tile for which
removal of those references seemed appropriate.  The configuration is
removed from README and from build-many-glibcs.py.  contrib.texi keeps
mention of removed contributions, but I updated Chris Metcalf's entry
to reflect that he also contributed the non-removed support for the
generic Linux kernel syscall interface.
__ASSUME_FADVISE64_64_NO_ALIGN support is removed, as it was only used
by tile.

	* sysdeps/tile: Remove.
	* sysdeps/unix/sysv/linux/tile: Likewise.
	* README (tilegx-*-linux-gnu): Remove from list of supported
	configurations.
	* manual/contrib.texi (Contributors): Mention Chris Metcalf's
	contribution of support for generic Linux kernel syscall
	interface.
	* scripts/build-many-glibcs.py (Context.add_all_configs): Remove
	tilegx configurations.
	(Config.install_linux_headers): Do not handle tile.
	* sysdeps/unix/sysv/linux/aarch64/ldsodefs.h: Do not mention Tile
	in comment.
	* sysdeps/unix/sysv/linux/nios2/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/posix_fadvise.c: Likewise.
	[__ASSUME_FADVISE64_64_NO_ALIGN] (__ALIGNMENT_ARG): Remove
	conditional undefine and redefine.
	* sysdeps/unix/sysv/linux/posix_fadvise64.c: Do not mention Tile
	in comment.
	[__ASSUME_FADVISE64_64_NO_ALIGN] (__ALIGNMENT_ARG): Remove
	conditional undefine and redefine.

1 files changed, 0 insertions, 84 deletions

diff --git a/sysdeps/unix/sysv/linux/tile/bits/sigaction.h b/sysdeps/unix/sysv/linux/tile/bits/sigaction.h
deleted file mode 100644
index d0467bdc2b..0000000000
--- a/sysdeps/unix/sysv/linux/tile/bits/sigaction.h
+++ /dev/null
@@ -1,84 +0,0 @@
-/* Copyright (C) 2011-2018 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library.  If not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#ifndef _BITS_SIGACTION_H
-#define _BITS_SIGACTION_H 1
-
-#ifndef _SIGNAL_H
-# error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
-#endif
-
-/* Structure describing the action to be taken when a signal arrives.  */
-struct sigaction
-  {
-    /* Signal handler.  */
-#if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
-    union
-      {
-	/* Used if SA_SIGINFO is not set.  */
-	__sighandler_t sa_handler;
-	/* Used if SA_SIGINFO is set.  */
-	void (*sa_sigaction) (int, siginfo_t *, void *);
-      }
-    __sigaction_handler;
-# define sa_handler	__sigaction_handler.sa_handler
-# define sa_sigaction	__sigaction_handler.sa_sigaction
-#else
-    __sighandler_t sa_handler;
-#endif
-
-    /* Additional set of signals to be blocked.  */
-    __sigset_t sa_mask;
-
-    /* Special flags.  */
-    int sa_flags;
-
-    /* Restore handler.  */
-    void (*sa_restorer) (void);
-  };
-
-/* Bits in `sa_flags'.  */
-#define	SA_NOCLDSTOP  1		 /* Don't send SIGCHLD when children stop.  */
-#define SA_NOCLDWAIT  2		 /* Don't create zombie on child death.  */
-#define SA_SIGINFO    4		 /* Invoke signal-catching function with
-				    three arguments instead of one.  */
-#if defined __USE_XOPEN_EXTENDED || defined __USE_MISC
-# define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
-#endif
-#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
-# define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
-# define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
-				    its handler is being executed.  */
-# define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
-#endif
-#ifdef __USE_MISC
-# define SA_NOPTRACE  0x02000000 /* Don't ptrace this signal. */
-# define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
-
-/* Some aliases for the SA_ constants.  */
-# define SA_NOMASK    SA_NODEFER
-# define SA_ONESHOT   SA_RESETHAND
-# define SA_STACK     SA_ONSTACK
-#endif
-
-/* Values for the HOW argument to `sigprocmask'.  */
-#define	SIG_BLOCK     0		 /* Block signals.  */
-#define	SIG_UNBLOCK   1		 /* Unblock signals.  */
-#define	SIG_SETMASK   2		 /* Set the set of blocked signals.  */
-
-#endif