Perform scavenge in idle tasks.

test/cctest/test-unboxed-doubles.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // TODO(mythria): Remove this define after this flag is turned on globally
 #define V8_IMMINENT_DEPRECATION_WARNINGS
 
 #include <stdlib.h>
 #include <utility>
 
@@ skipping 1422 matching lines @@
 
   int object_size = my_map->instance_size();
 
   // Step 2: allocate a lot of objects so to almost fill new space: we need
   // just enough room to allocate JSObject and thus fill the newspace.
 
   int allocation_amount =
       Min(FixedArray::kMaxSize, Page::kMaxRegularHeapObjectSize + kPointerSize);
   int allocation_len = LenFromSize(allocation_amount);
   NewSpace* new_space = heap->new_space();
+  DisableInlineAllocationSteps(new_space);
   Address* top_addr = new_space->allocation_top_address();
   Address* limit_addr = new_space->allocation_limit_address();
   while ((*limit_addr - *top_addr) > allocation_amount) {
     CHECK(!heap->always_allocate());
     Object* array = heap->AllocateFixedArray(allocation_len).ToObjectChecked();
     CHECK(new_space->Contains(array));
   }
 
   // Step 3: now allocate fixed array and JSObject to fill the whole new space.
   int to_fill = static_cast<int>(*limit_addr - *top_addr - object_size);
@@ skipping 234 matching lines @@
 
 // TODO(ishell): add respective tests for property kind reconfiguring from
 // accessor field to double, once accessor fields are supported by
 // Map::ReconfigureProperty().
 
 
 // TODO(ishell): add respective tests for fast property removal case once
 // Map::ReconfigureProperty() supports that.
 
 #endif