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, 62 deletions

diff --git a/sysdeps/tile/jmpbuf-offsets.h b/sysdeps/tile/jmpbuf-offsets.h
deleted file mode 100644
index 8285826e98..0000000000
--- a/sysdeps/tile/jmpbuf-offsets.h
+++ /dev/null
@@ -1,62 +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/>.  */
-
-/* We don't use most of these symbols; they are here for documentation. */
-#define JB_R30  0
-#define JB_R31  1
-#define JB_R32  2
-#define JB_R33  3
-#define JB_R34  4
-#define JB_R35  5
-#define JB_R36  6
-#define JB_R37  7
-#define JB_R38  8
-#define JB_R39  9
-#define JB_R40  10
-#define JB_R41  11
-#define JB_R42  12
-#define JB_R43  13
-#define JB_R44  14
-#define JB_R45  15
-#define JB_R46  16
-#define JB_R47  17
-#define JB_R48  18
-#define JB_R49  19
-#define JB_R50  20
-#define JB_R51  21
-#define JB_FP   22  /* r52 */
-#define JB_TP   23  /* r53 */
-#define JB_SP   24  /* r54 */
-#define JB_PC   25  /* normally LR, r55 */
-#define JB_ICS  26  /* interrupt critical section bit */
-
-/* We save space for some extra state to accommodate future changes.  */
-#define JB_LEN  32  /* number of words */
-
-#define JB_SIZE (JB_LEN * REGSIZE)
-
-/* Helper macro used by all the setjmp/longjmp assembly code. */
-#define FOR_EACH_CALLEE_SAVED_REG(f)                              \
-  .no_require_canonical_reg_names;                f(r30); f(r31); \
-  f(r32); f(r33); f(r34); f(r35); f(r36); f(r37); f(r38); f(r39); \
-  f(r40); f(r41); f(r42); f(r43); f(r44); f(r45); f(r46); f(r47); \
-  f(r48); f(r49); f(r50); f(r51); f(r52); f(r53); f(r54); f(r55)
-
-/* Helper for generic ____longjmp_chk(). */
-#define JB_FRAME_ADDRESS(buf) \
-  ((void *) (unsigned long) (buf[JB_SP]))