V8: increase number of shards for arm64 gc stress.

scripts/slave/recipe_modules/v8/builders.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Contains the bulk of the V8 builder configurations so they can be reused
 # from multiple recipes.
 
 from recipe_engine.types import freeze
 from testing import V8NoExhaustiveVariants, V8Variant, V8VariantNeutral
 
@@ skipping 12 matching lines @@
 
 # Top-level test configs for convenience.
 Benchmarks = TestStepConfig('benchmarks')
 Deopt = TestStepConfig('deopt')
 Fuzz = TestStepConfig('jsfunfuzz')
 GCMole = TestStepConfig('gcmole')
 IgnitionTurbofan = TestStepConfig('ignition_turbofan')
 Mjsunit = TestStepConfig('mjsunit')
 Mjsunit_2 = TestStepConfig('mjsunit', shards=2)
 Mjsunit_3 = TestStepConfig('mjsunit', shards=3)
+Mjsunit_4 = TestStepConfig('mjsunit', shards=4)
 MjsunitExtra_3 = TestStepConfig('mjsunit_extra', shards=3)
 MjsunitIgnitionTurbofan_2 = TestStepConfig(
     'mjsunit_ignition_turbofan', shards=2)
 MjsunitSPFrameAccess = TestStepConfig('mjsunit_sp_frame_access')
 Mozilla = TestStepConfig('mozilla')
 OptimizeForSize = TestStepConfig('optimize_for_size')
 Presubmit = TestStepConfig('presubmit')
 SimdJs = TestStepConfig('simdjs')
 SimpleLeak = TestStepConfig('simpleleak')
 Test262 = TestStepConfig('test262')
@@ skipping 1418 matching lines @@
         'v8_config_kwargs': {
           'BUILD_CONFIG': 'Debug',
           'TARGET_BITS': 64,
         },
         'bot_type': 'builder_tester',
         'enable_swarming': True,
         'swarming_properties': {
           'default_expiration': 2 * 60 * 60,
           'default_priority': 35,
         },
-        'tests': [Mjsunit_3, Webkit],
+        'tests': [Mjsunit_4, Webkit],
         'testing': {'platform': 'linux'},
       },
 ####### Category: MIPS
       'V8 Mips - builder': {
         # TODO(machenbach): Switch this bot manually to gn.
         'chromium_apply_config': ['no_snapshot', 'no_i18n'],
         'v8_apply_config': ['mips_cross_compile', 'no_snapshot', 'no_i18n'],
         'v8_config_kwargs': {
           'BUILD_CONFIG': 'Release',
           'TARGET_ARCH': 'mips',
@@ skipping 1292 matching lines @@
 win['chromium_apply_config'].extend(['msvs2013'])
 
 BUILDERS = freeze(BUILDERS)
 BRANCH_BUILDERS = freeze(BRANCH_BUILDERS)
 
 def iter_builders():
   for mastername, master_config in BUILDERS.iteritems():
     builders = master_config['builders']
     for buildername, bot_config in builders.iteritems():
       yield mastername, builders, buildername, bot_config