MIPS: Add big-endian support for MIPS.

test/test262/test262.status

 # Copyright 2011 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
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 #
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@@ skipping 81 matching lines @@
   'S15.9.3.1_A5_T5': [PASS, FAIL_OK],
   'S15.9.3.1_A5_T6': [PASS, FAIL_OK],
 
   ############################ SKIPPED TESTS #############################
 
   # These tests take a looong time to run in debug mode.
   'S15.1.3.1_A2.5_T1': [PASS, ['mode == debug', SKIP]],
   'S15.1.3.2_A2.5_T1': [PASS, ['mode == debug', SKIP]],
 }],  # ALWAYS
 
-['arch == arm or arch == mipsel or arch == arm64', {
+['arch == arm or arch == mipsel or arch == mips or arch == arm64', {
 
   # TODO(mstarzinger): Causes stack overflow on simulators due to eager
   # compilation of parenthesized function literals. Needs investigation.
   'S13.2.1_A1_T1': [SKIP],
 
   # BUG(3251225): Tests that timeout with --nocrankshaft.
   'S15.1.3.1_A2.4_T1': [SKIP],
   'S15.1.3.1_A2.5_T1': [SKIP],
   'S15.1.3.2_A2.4_T1': [SKIP],
   'S15.1.3.2_A2.5_T1': [SKIP],
   'S15.1.3.3_A2.3_T1': [SKIP],
   'S15.1.3.4_A2.3_T1': [SKIP],
-}],  # 'arch == arm or arch == mipsel or arch == arm64'
+}],  # 'arch == arm or arch == mipsel or arch == mips or arch == arm64'
 ]