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, 57 deletions

diff --git a/sysdeps/tile/__longjmp.S b/sysdeps/tile/__longjmp.S
deleted file mode 100644
index 17d82b92f2..0000000000
--- a/sysdeps/tile/__longjmp.S
+++ /dev/null
@@ -1,57 +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/>.  */
-
-#include <sysdep.h>
-#include <jmpbuf-offsets.h>
-#include <asm-syntax.h>
-#include <arch/spr_def.h>
-
-/* PL to return to via iret in longjmp */
-#define RETURN_PL 0
-
-	.text
-ENTRY (__longjmp)
-	FEEDBACK_ENTER(__longjmp)
-
-#define RESTORE(r) { ld r, r0 ; ADDI_PTR r0, r0, REGSIZE }
-	FOR_EACH_CALLEE_SAVED_REG(RESTORE)
-
-	/* Make longjmp(buf, 0) return "1" instead.
-	   At the same time, construct our iret context; we set ICS so
-	   we can validly load EX_CONTEXT for iret without being
-	   interrupted halfway through.  */
-	{
-	 ld r2, r0   /* retrieve ICS bit from jmp_buf */
-	 movei r3, 1
-	 cmpeqi r0, r1, 0
-	}
-	{
-	 mtspr INTERRUPT_CRITICAL_SECTION, r3
-	 shli r2, r2, SPR_EX_CONTEXT_0_1__ICS_SHIFT
-	}
-	{
-	 mtspr EX_CONTEXT_0_0, lr
-	 ori r2, r2, RETURN_PL
-	}
-	{
-	 or r0, r1, r0
-	 mtspr EX_CONTEXT_0_1, r2
-	}
-	iret
-	jrp lr   /* Keep the backtracer happy. */
-END (__longjmp)