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='2020-10-26 16:33:39 +0100'>2020-10-26</span></td><td><a href='/guix/commit/gnu/tests/base.scm?id=572c59a7a1ac94a1fda78fcd2cc37c3e335b297f'>tests: Fix nss-mdns test.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-09-10 14:59:53 +0200'>2020-09-10</span></td><td><a href='/guix/commit/gnu/tests/base.scm?id=6e71514a2992eed1cfa2306f65ca750d65708bc4'>tests: install: Fix gui-installed-desktop-os-encrypted test.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-04-07 12:31:36 +0200'>2020-04-07</span></td><td><a href='/guix/commit/gnu/tests/base.scm?id=3302e03ba0edca49347c6a2b215e56bd53a6b113'>services: guix: Add 'set-http-proxy' action.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-04-06 23:56:24 +0200'>2020-04-06</span></td><td><a href='/guix/commit/gnu/tests/base.scm?id=d7113bb655ff80a868a9e624c913f9d23e6c63ad'>services: syslog: Create log files as non-world-readable.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-05 23:40:22 +0100'>2020-03-05</span></td><td><a href='/guix/commit/gnu/tests/base.scm?id=91ba90c18b9ca3512e3a3ab359119f94f94c5b17'>tests: 'run-basic-test' can enter a root password.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-06-24 17:50:08 +0200'>2019-06-24</span></td><td><a href='/guix/commit/gnu/tests/base.scm?id=f9d55c4925c69473ca85ecaff6e223767e690550'>tests: Import (guix build utils) in the marionette.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-15 12:18:51 +0200'>2019-05-15</span></td><td><a href='/guix/commit/gnu/tests/base.scm?id=33572a36624aa1c5cca409cfee36eb67982f4891'>tests: Skip unreliable "herd invalidate nscd" test.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-15 12:18:51 +0200'>2019-05-15</span></td><td><a href='/guix/commit/gnu/tests/base.scm?id=8b310793d2b7d3cf5b3a5301423640dcf68e2528'>tests: 'getlogin' test creates its file atomically.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-09 12:11:36 +0200'>2019-05-09</span></td><td><a href='/guix/commit/gnu/tests/base.scm?id=e6b1a2248ff164e14d1b2f495224faf8a8326142'>services: Log-in services now require "pam_loginuid".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>