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)
href='/guix/log/?id=a3baaaa07a77ae03e891ed5b462d0836d8a2a66e'>root</a>/<a href='/guix/log/gnu?id=a3baaaa07a77ae03e891ed5b462d0836d8a2a66e'>gnu</a>/<a href='/guix/log/gnu/packages?id=a3baaaa07a77ae03e891ed5b462d0836d8a2a66e'>packages</a>/<a href='/guix/log/gnu/packages/adns.scm?id=a3baaaa07a77ae03e891ed5b462d0836d8a2a66e'>adns.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/packages/adns.scm?id=a3baaaa07a77ae03e891ed5b462d0836d8a2a66e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-02-18 13:05:07 +0200'>2018-02-18</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=c9b7ed7de9f6f79c0e90bf7b88d61598fd07b958'>gnu: c-ares: Update to 1.14.0.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-06-20 19:04:06 +0200'>2017-06-20</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=4afd813711eafaf2c66429c102df1525c9defb81'>gnu: c-ares: Update to 1.13.0 [fixes CVE-2017-1000381].</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-03-30 01:30:16 +0200'>2017-03-30</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=6fd52309b8f52c9bb59fccffac53e029ce94b698'>gnu: Use HTTPS for almost all gnu.org HOME-PAGEs.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2016-09-29 11:18:52 -0400'>2016-09-29</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=0da1b7062af798423eeaf37733467dca224b5029'>gnu: c-ares: Update to 1.12.0 [fixes CVE-2016-5180].</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2016-08-13 20:24:43 +0300'>2016-08-13</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=91fd8dd2c5ebb8984cb939e4c12c4a0a1b07a86f'>gnu: adns: Update to 1.5.1.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2016-02-22 10:43:17 +0200'>2016-02-22</span></td><td><a href='/guix/commit/gnu/packages/adns.scm?id=066651d4122aff54b53d256fd41c9130e69b9008'>gnu: c-ares: Update to 1.11.0.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>