Revert the following commit to work around a bootstrap comparison failure on
ARMv7, as reported at <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71399>.

commit f6ab85b7049a03962ea98924d00802da357a1ad3
Author: renlin <renlin@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Wed Dec 2 14:06:31 2015 +0000

    [PR67383][ARM][4.9]Backport of "Allow any register for DImode values in Thumb2"
    
    This partially fix PR67383. It allows the reload more flexibility to choose
    spilling pseudo registers.
    
    
    gcc/ChangeLog:
    
    2015-12-02  Renlin Li  <renlin.li@arm.com>
    
            Backport from mainline.
            2014-04-22  Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
    
            * config/arm/arm.c (arm_hard_regno_mode_ok): Loosen
            restrictions on core registers for DImode values in Thumb2.
    
    
    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_9-branch@231177 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 8ba6060..d9028a1 100644
--- b/gcc/config/arm/arm.c
+++ a/gcc/config/arm/arm.c
@@ -22624,19 +22624,12 @@
     }
 
   /* We allow almost any value to be stored in the general registers.
-     Restrict doubleword quantities to even register pairs in ARM state
-     so that we can use ldrd.  Do not allow very large Neon structure
-     opaque modes in general registers; they would use too many.  */
+     Restrict doubleword quantities to even register pairs so that we can
+     use ldrd.  Do not allow very large Neon structure opaque modes in
+     general registers; they would use too many.  */
   if (regno <= LAST_ARM_REGNUM)
-    {
-      if (ARM_NUM_REGS (mode) > 4)
-	  return FALSE;
-
-      if (TARGET_THUMB2)
-	return TRUE;
-
-      return !(TARGET_LDRD && GET_MODE_SIZE (mode) > 4 && (regno & 1) != 0);
-    }
+    return !(TARGET_LDRD && GET_MODE_SIZE (mode) > 4 && (regno & 1) != 0)
+      && ARM_NUM_REGS (mode) <= 4;
 
   if (regno == FRAME_POINTER_REGNUM
       || regno == ARG_POINTER_REGNUM)
ath'>path: <a href='/guix/log/?id=e44d774481828ebe4151b3b26e999e07be27c984'>root</a>/<a href='/guix/log/gnu?id=e44d774481828ebe4151b3b26e999e07be27c984'>gnu</a>/<a href='/guix/log/gnu/system?id=e44d774481828ebe4151b3b26e999e07be27c984'>system</a>/<a href='/guix/log/gnu/system/accounts.scm?id=e44d774481828ebe4151b3b26e999e07be27c984'>accounts.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/system/accounts.scm?id=e44d774481828ebe4151b3b26e999e07be27c984&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-03-25 23:37:06 +0100'>2019-03-25</span></td><td><a href='/guix/commit/gnu/system/accounts.scm?id=cf848cc0a17a3a58d600116896f6e7abfb0440d4'>accounts: Add default value for the 'home-directory' field of &lt;user-account&gt;.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-07 20:05:09 +0100'>2019-03-07</span></td><td><a href='/guix/commit/gnu/system/accounts.scm?id=6061d01512081c93c53fdd1d4302b36696403061'>activation: Operate on &lt;user-account&gt; and &lt;user-group&gt; records.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-07 20:04:02 +0100'>2019-03-07</span></td><td><a href='/guix/commit/gnu/system/accounts.scm?id=f6f67b87c08fe7b901db834c714aceaef2b62b60'>system: Add (gnu system accounts).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>