MIPS64: Add big-endian support for mips64.

test/mozilla/mozilla.status

Index: test/mozilla/mozilla.status
diff --git a/test/mozilla/mozilla.status b/test/mozilla/mozilla.status
index 70bbd36f18d1d8e6f8d07dbc1344e69ec816d8fa..d70c922b0d39c387b070ae1604c7315593d47140 100644
--- a/test/mozilla/mozilla.status
+++ b/test/mozilla/mozilla.status
@@ -887,7 +887,7 @@
 }],  # 'arch ==  arm64'
 
 
-['arch == mipsel or arch == mips64el', {
+['arch == mipsel or arch == mips64el or arch == mips64', {
 
   # BUG(3251229): Times out when running new crankshaft test script.
   'ecma_3/RegExp/regress-311414': [SKIP],
@@ -904,7 +904,7 @@
 
   # BUG(1040): Allow this test to timeout.
   'js1_5/GC/regress-203278-2': [PASS, TIMEOUT, NO_VARIANTS],
-}],  # 'arch == mipsel or arch == mips64el'
+}],  # 'arch == mipsel or arch == mips64el or arch == mips64'
 
 ['arch == mipsel and simulator_run == True', {
   # Crashes due to C stack overflow.