gdb: move AIX_TEXT_SEGMENT_BASE to rs6000-aix-tdep.c, remove rs6000-tdep.h

The contents of rs6000-tdep.h (AIX_TEXT_SEGMENT_BASE) is AIX-specific,
so I thought that this file should be named rs6000-aix-tdep.h.  But
there's already a rs6000-aix-tdep.h, so then I though
AIX_TEXT_SEGMENT_BASE should simply be moved there, and rs6000-tdep.h
deleted.  But then I realized that AIX_TEXT_SEGMENT_BASE is only used in
rs6000-aix-tdep.c, so move it to the beginning of that file.

Change-Id: Ia212c6fae202f31aedb46575821cd642beeda7a3

gdb/Makefile.in

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 5e6d74e..af8f1cc 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -1418,7 +1418,6 @@
 	riscv-ravenscar-thread.h \
 	riscv-tdep.h \
 	rs6000-aix-tdep.h \
-	rs6000-tdep.h \
 	run-on-main-thread.h \
 	s390-linux-tdep.h \
 	s390-tdep.h \

gdb/rs6000-aix-nat.c

diff --git a/gdb/rs6000-aix-nat.c b/gdb/rs6000-aix-nat.c
index c266c50..72e59e5 100644
--- a/gdb/rs6000-aix-nat.c
+++ b/gdb/rs6000-aix-nat.c
@@ -30,7 +30,6 @@
 #include "inf-child.h"
 #include "inf-ptrace.h"
 #include "ppc-tdep.h"
-#include "rs6000-tdep.h"
 #include "rs6000-aix-tdep.h"
 #include "exec.h"
 #include "observable.h"

gdb/rs6000-aix-tdep.c

diff --git a/gdb/rs6000-aix-tdep.c b/gdb/rs6000-aix-tdep.c
index 11cae6a..ce5afb7 100644
--- a/gdb/rs6000-aix-tdep.c
+++ b/gdb/rs6000-aix-tdep.c
@@ -30,7 +30,6 @@
 #include "infcall.h"
 #include "objfiles.h"
 #include "breakpoint.h"
-#include "rs6000-tdep.h"
 #include "ppc-tdep.h"
 #include "rs6000-aix-tdep.h"
 #include "xcoffread.h"
@@ -66,6 +65,9 @@
 /* STKMIN64+grp1 offset. 112+56=168 */
 #define SIG_FRAME_FP_OFFSET64 168
 
+/* Minimum possible text address in AIX.  */
+#define AIX_TEXT_SEGMENT_BASE 0x10000000
+
 static struct trad_frame_cache *
 aix_sighandle_frame_cache (struct frame_info *this_frame,
 			   void **this_cache)

gdb/rs6000-tdep.h

diff --git a/gdb/rs6000-tdep.h b/gdb/rs6000-tdep.h
deleted file mode 100644
index ecebac9..0000000
--- a/gdb/rs6000-tdep.h
+++ /dev/null
@@ -1,24 +0,0 @@
-/* Copyright (C) 2006-2021 Free Software Foundation, Inc.
-
-   This file is part of GDB.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program 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 General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#ifndef RS6000_TDEP_H
-#define RS6000_TDEP_H
-
-/* Minimum possible text address in AIX.  */
-#define AIX_TEXT_SEGMENT_BASE 0x10000000
-
-#endif /* RS6000_TDEP_H */