provides a mechanism for optimizing compilers to select the different Register configuration.

test/cctest/cctest.status

 # Copyright 2011 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 293 matching lines @@
 
   # BUG(1075): Unresolved crashes on MIPS also.
   'test-serialize/Deserialize': [SKIP],
   'test-serialize/DeserializeFromSecondSerializationAndRunScript2': [SKIP],
   'test-serialize/DeserializeAndRunScript2': [SKIP],
   'test-serialize/DeserializeFromSecondSerialization': [SKIP],
 }],  # 'arch == mips64el or arch == mips64'
 
 ##############################################################################
 ['arch == x87', {
-  'test-run-machops/RunFloat64InsertLowWord32': [SKIP]
+  'test-run-machops/RunFloat64InsertLowWord32': [SKIP],
+  'test-run-native-calls/MixedParams_0': [SKIP],
+  'test-run-native-calls/MixedParams_1': [SKIP],
+  'test-run-native-calls/MixedParams_2': [SKIP],
+  'test-run-native-calls/MixedParams_3': [SKIP],
 }],  # 'arch == x87'
 
 ##############################################################################
 ['arch == android_arm or arch == android_ia32', {
 
   # Tests crash as there is no /tmp directory in Android.
   'test-log/LogAccessorCallbacks': [SKIP],
   'test-log/LogCallbacks': [SKIP],
   'test-log/ProfLazyMode': [SKIP],
 }],  # 'arch == android_arm or arch == android_ia32'
@@ skipping 114 matching lines @@
 ##############################################################################
 ['arch == ppc and simulator_run == True or arch == ppc64 and simulator_run == True', {
 
   # Pass but take too long with the simulator.
   'test-api/Threading1': [PASS, SLOW],
   'test-api/Threading2': [PASS, SLOW],
   'test-api/ExternalArrays': [PASS, SLOW],
 
 }],  # 'arch == ppc64 and simulator_run == True'
 ]