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='2021-05-29 07:23:04 +0200'>2021-05-29</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=64907645ec86be4a12db66c98343a9e1ea6f781d'>gnu: nyacc: Update to 1.04.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mes.scm (nyacc): Update to 1.04.0.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2021-03-29 20:03:12 +0100'>2021-03-29</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=ebeb018ca32c3da0dc820440b2da8d229f78946b'>gnu: nyacc: Update to 1.03.6.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mes.scm (nyacc): Update to 1.03.6.

Signed-off-by: Christopher Baines &lt;mail@cbaines.net&gt;
</span></span></td><td>Xinglu Chen</td></tr>
<tr><td><span title='2021-03-14 17:32:01 +0100'>2021-03-14</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=7327295462fccae4ee3e9bf74962c82d3445fec8'>gnu: mes: Remove aarch64-linux from supported-systems.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mes.scm (mes)[supported-systems]: Remove aarch64-linux.
Thinko: mes only builds on aarch64-linux using --system=armhf-linux.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2021-03-14 16:49:49 +0100'>2021-03-14</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=7982adb40a0253290fba9e1dbd43b153753159a7'>gnu: mescc-tools: Build for armhf-linux and aarch64-linux too.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mes.scm (mescc-tools)[supported-systems]: New field, overriding
the v0.5.2 version.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2021-03-14 12:10:07 +0100'>2021-03-14</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=1d684aedf839ca35c2f8784f168fd56835402ab6'>gnu: mes: Update to 0.23.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mes.scm (mes)[source]: Update to 0.23.
[supported-systems]: Add aarch64-linux, armhf-linux.
(mes-rb5)[version,source,supported-systems]: Revert to v0.22.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2021-03-14 11:50:55 +0100'>2021-03-14</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=ba485217b8ee55792abe6360a208d8c12e3ee7a0'>gnu: mes: Update to nyacc-1.00.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mes.scm (mes)[propagated-inputs]: Use nyacc-1.00.2.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2021-03-14 11:50:51 +0100'>2021-03-14</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=8b05461cabaeababa314768d2e48cec531aea9aa'>gnu: Add nyacc-1.00.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mes.scm (nyacc-1.00.2): New variable.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2021-03-14 11:50:43 +0100'>2021-03-14</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=87a8eaf671f7619df782a662c12a4ffeba8183dc'>gnu: mescc-tools: Update to 0.7.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mes.scm (mescc-tools)[source]: Update to 0.7.0.
[arguments]: Add patch-prefix phase to remove hardcoded "/usr/bin".
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>