Enable the workaround for the Loongson 2F bug by default.

Patch by Mark H Weaver <mhw@netris.org>.

--- binutils/gas/config/tc-mips.c.orig	2012-09-04 10:21:03.000000000 -0400
+++ binutils/gas/config/tc-mips.c	2013-10-06 02:23:21.651983768 -0400
@@ -934,10 +934,10 @@ enum fix_vr4120_class
 };
 
 /* ...likewise -mfix-loongson2f-jump.  */
-static bool mips_fix_loongson2f_jump;
+static bool mips_fix_loongson2f_jump = FALSE;
 
 /* ...likewise -mfix-loongson2f-nop.  */
-static bool mips_fix_loongson2f_nop;
+static bool mips_fix_loongson2f_nop = TRUE;
 
 /* True if -mfix-loongson2f-nop or -mfix-loongson2f-jump passed.  */
 static bool mips_fix_loongson2f;
--- binutils/gas/testsuite/gas/mips/mips.exp.orig	2012-09-04 10:17:13.000000000 -0400
+++ binutils/gas/testsuite/gas/mips/mips.exp	2013-10-06 02:23:21.663983768 -0400
@@ -110,6 +110,12 @@ proc mips_arch_init {} {
 
     # Catch because the variable won't be set the first time through.
     catch {unset mips_arches}
+
+    # Disable the loongson2f nop fix by default, because most of the
+    # existing test cases for mips will fail otherwise.
+    global ASFLAGS
+    set old_ASFLAGS "$ASFLAGS"
+    set ASFLAGS "$ASFLAGS -mno-fix-loongson2f-nop"
 }
 
 # mips_arch_create ARCH GPRSIZE EXTENDS PROPS AS_FLAGS OBJDUMP_FLAGS \
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<tr><td><span title='2019-08-16 23:00:27 +0200'>2019-08-16</span></td><td><a href='/guix/commit/gnu/build/linux-modules.scm?id=c85ccf60bfe4ef58110bb61f40df7f526d2a5735'>linux-modules: Define and use a module name database.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/34902&gt;.
Reported by Julien Lepiller &lt;julien@lepiller.eu&gt;.

* gnu/build/linux-modules.scm (module-formal-name): New procedure.
(load-linux-modules-from-directory)[lookup-module]: Remove.
[module-name-&gt;file-name]: New variable.  Use it.
(module-name-&gt;file-name/guess, module-name-lookup)
(write-module-name-database): New procedures.
* gnu/system/linux-initrd.scm (flat-linux-module-directory): Call
'write-module-name-database'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-08-16 23:00:27 +0200'>2019-08-16</span></td><td><a href='/guix/commit/gnu/build/linux-modules.scm?id=e1a9a7f2755dc23e1f4635c8aee45e1467c01619'>linux-modules: Add 'load-linux-modules-from-directory'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/linux-modules.scm (load-linux-modules-from-directory): New
procedure.
* gnu/build/linux-boot.scm (boot-system)[lookup-module]: Remove.
Use 'load-linux-modules-from-directory' instead.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-08-16 23:00:27 +0200'>2019-08-16</span></td><td><a href='/guix/commit/gnu/build/linux-modules.scm?id=2a693b69ca35ee942395e1adf458a666846881fc'>linux-modules: Add "modules.devname" writer.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/linux-modules.scm (aliases-&gt;device-tuple)
(write-module-device-database): New procedures.
(%not-dash): New variable.

Co-authored-by: Danny Milosavljevic &lt;dannym@scratchpost.org&gt;.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-08-16 23:00:27 +0200'>2019-08-16</span></td><td><a href='/guix/commit/gnu/build/linux-modules.scm?id=4f8b9d1a6f551697996c77b6e1741007e1f7c9cd'>linux-modules: Add "modules.alias" writer.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/linux-modules.scm (write-module-alias-database): New
procedure.

Co-authored-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Danny Milosavljevic</td></tr>