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, 83 deletions

diff --git a/sysdeps/tile/sysdep.h b/sysdeps/tile/sysdep.h
deleted file mode 100644
index bb82d3ca6c..0000000000
--- a/sysdeps/tile/sysdep.h
+++ /dev/null
@@ -1,83 +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 <sysdeps/generic/sysdep.h>
-#include <bits/wordsize.h>
-#include <arch/abi.h>
-
-#if defined __ASSEMBLER__ || defined REQUEST_ASSEMBLER_MACROS
-
-#include <feedback.h>
-
-/* Make use of .size directive.  */
-#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
-
-/* Define an entry point visible from C.  */
-#define	ENTRY(name)							      \
-  .globl C_SYMBOL_NAME(name);						      \
-  .type C_SYMBOL_NAME(name),@function;					      \
-  .align 8;								      \
-  C_LABEL(name)								      \
-  cfi_startproc;							      \
-  CALL_MCOUNT
-
-#undef	END
-#define END(name)							      \
-  cfi_endproc;								      \
-  ASM_SIZE_DIRECTIVE(name)
-
-/* Since C identifiers are not normally prefixed with an underscore
-   on this system, the asm identifier `syscall_error' intrudes on the
-   C name space.  Make sure we use an innocuous name.  */
-#define	syscall_error	__syscall_error
-#define mcount		__mcount
-
-/* If compiled for profiling, call `mcount' at the start of each function.
-   The mcount code requires the caller PC in r10.  The `mcount' function
-   sets lr back to the value r10 had on entry when it returns.  */
-#ifdef	PROF
-#define CALL_MCOUNT { move r10, lr; jal mcount }
-#else
-#define CALL_MCOUNT             /* Do nothing.  */
-#endif
-
-/* Local label name for asm code. */
-#define L(name)		.L##name
-
-/* Specify the size in bytes of a machine register.  */
-#define REGSIZE		8
-
-/* Provide "pointer-oriented" instruction variants.  These differ not
-   just for tilepro vs tilegx, but also for tilegx -m64 vs -m32.  */
-#if __WORDSIZE == 32
-#define ADD_PTR		addx
-#define ADDI_PTR	addxi
-#define ADDLI_PTR	addxli
-#define LD_PTR		ld4s
-#define ST_PTR		st4
-#define SHL_PTR_ADD	shl2add
-#else
-#define ADD_PTR		add
-#define ADDI_PTR	addi
-#define ADDLI_PTR	addli
-#define LD_PTR		LD
-#define ST_PTR		ST
-#define SHL_PTR_ADD	shl3add
-#endif
-
-#endif /* __ASSEMBLER__ */