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, 2 insertions, 8 deletions

diff --git a/sysdeps/unix/sysv/linux/posix_fadvise.c b/sysdeps/unix/sysv/linux/posix_fadvise.c
index 08ccc220d7..d676a68140 100644
--- a/sysdeps/unix/sysv/linux/posix_fadvise.c
+++ b/sysdeps/unix/sysv/linux/posix_fadvise.c
@@ -31,9 +31,8 @@
    (redefined to __NR_fadvise64_64 in kernel-features.h) that behaves as
    __NR_fadvise64_64 (without the aligment argument required for the ABI).
 
-   Third option will be used by both tile 32-bits and mips o32.  Tile
-   will set __ASSUME_FADVISE64_64_NO_ALIGN to issue a 6 argument syscall,
-   while mips will use a 7 argument one with __NR_fadvise64.
+   Third option will be used by mips o32.  Mips will use a 7 argument
+   syscall with __NR_fadvise64.
 
    s390 implements fadvice64_64 using a specific struct with arguments
    packed inside.  This is the only implementation handled in arch-specific
@@ -53,11 +52,6 @@ posix_fadvise (int fd, off_t offset, off_t len, int advise)
 				   SYSCALL_LL (offset), SYSCALL_LL (len));
 #  else
 
-#   ifdef __ASSUME_FADVISE64_64_NO_ALIGN
-#    undef __ALIGNMENT_ARG
-#    define __ALIGNMENT_ARG
-#   endif
-
 #   ifndef __NR_fadvise64_64
 #    define __NR_fadvise64_64 __NR_fadvise64
 #   endif