Move tilegx, tilepro, and linux-generic from ports to libc.

I've moved the TILE-Gx and TILEPro ports to the main sysdeps hierarchy,
along with the linux-generic ports infrastructure.  Beyond the README
update, the move was just

    git mv ports/sysdeps/tile sysdeps/tile
    git mv ports/sysdeps/unix/sysv/linux/tile \
      sysdeps/unix/sysv/linux/tile
    git mv ports/sysdeps/unix/sysv/linux/generic \
      sysdeps/unix/sysv/linux/generic

I updated the relevant ChangeLogs along the lines of the ARM move
in commit c6bfe5c4d75 and tested the 64-bit tilegx build to confirm that
there were no changes in "objdump -dr" output in the shared objects.

1 files changed, 20 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/tile/nptl/waitpid.S b/sysdeps/unix/sysv/linux/tile/nptl/waitpid.S
new file mode 100644
index 0000000000..9aa793e12b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tile/nptl/waitpid.S
@@ -0,0 +1,20 @@
+/*
+extern pid_t __waitpid_nocancel (pid_t, int *, int) attribute_hidden;
+*/
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
+
+/* Call __NR_wait4, providing fourth argument (struct rusage *) as NULL. */
+#define PSEUDO_EXTRA move r3, zero;
+#include <sysdep-cancel.h>
+
+PSEUDO (__waitpid, wait4, 3)
+ret
+PSEUDO_END(__waitpid)
+
+libc_hidden_def (__waitpid)
+weak_alias (__waitpid, waitpid)
+libc_hidden_weak (waitpid)
+weak_alias (__waitpid, __libc_waitpid)
+libc_hidden_weak (__libc_waitpid)
+
+#endif