Remove gdb.base/branches.c

This patch removes gdb.base/branches.c which was added by the following
commit, but it is not used at all.

commit ea8122af
Author: John Metzler <jmetzler@cygnus>
Date:   Thu Apr 16 17:56:11 1998 +0000

    Thu Apr 16 10:52:34 1998  John Metzler  <jmetzler@cygnus.com>

        * gdb.base/branches.c: Code with lots of loops and
        subroutines. Used to test gdbs ability to single step through PC
        changes, especially to test mips-tdep.c:mips_next_pc

gdb/testsuite:

2016-02-25  Yao Qi  <yao.qi@linaro.org>

	* gdb.base/branches.c: Remove.

gdb/testsuite/ChangeLog

+2016-02-25  Yao Qi  <yao.qi@linaro.org>
+
+	* gdb.base/branches.c: Remove.
+
 2016-02-25  Marcin Kościelnicki  <koriakin@0x04.net>
 
 	PR gdb/13808

gdb/testsuite/gdb.base/branches.c

-/* Tests for single stepping through various branch conditions */
-
-int noscramble(int a)
-{
-  return a ;
-}
-
-int echo(int a)
-{ return noscramble(a) ; }
-
-int equaltest(int a,int b)
-{ int retval ;
-  if (a == b)
-    retval = noscramble(1) ;
-  else retval = noscramble(0) ;
-  return retval ;
-}
-
-int neqtest(int a , int b)
-{ int retval ;
-  if (a != b)
-    retval = echo(1) ;
-  else retval = echo(2) ;
-  return retval ;
-}
-int zerotest(int a )
-{ int retval ;
-  a = echo(a) ;
-  if (a ==0)
-    retval = echo(1) ;
-  else
-    retval = echo(0) ;
-  retval = echo(retval) ;
-  return retval ;
-}
-
-int zerotest2(int a)
-{
-  return (a==0) ;
-}
-
-int nonzerotest(int a)
-{
-  int retval ;
-  if (a != 0)
-    retval = echo(0) ;
-  else retval = echo(1) ;
-  return retval ;
-}
-
-int whiletest(int a)
-{
-  while (a > 0)
-    {
-      a-- ;
-    }
-  return 0 ;
-}
-int whiletest2(int a)
-{
-  while (a > 0)
-    {
-      a = noscramble(a) ;
-      a-- ;
-    }
-  return a ;
-}
-
-int decr(int x) { return x - 1  ; }
-
-int while3(int a)
-{
-  int b = a ;
-  while (a == b)
-    {
-      a = echo(a) ;
-      b = decr(b) ;
-    }
-  return a ;
-}
-
-void done (int x) { } 
-
-int main()
-{
-  int a,b,c,d ;
-  done(1) ;
-  a = echo(123456) ;
-  b = echo(123456) ;
-  c = echo(56789) ;
-  d = echo(0) ;
-#if 1
-  equaltest(a,b) ;
-  done(7) ;
-  equaltest(a,c) ;
-  done(8) ;
-  whiletest(3) ;  /* worked */
-  done(3) ;
-  while3(3) ;
-  done(6) ;
-#endif  
-  neqtest(a,b) ; 
-  neqtest(a,b) ; 
-  neqtest(a,c) ; 
-  zerotest(d) ;
-  zerotest(a) ;
-  done(5) ;
-  nonzerotest(d) ;
-  done(4) ;
-  nonzerotest(a) ;
-  done(111) ;
-  return 1 ;
-}