[heap] inline allocation steps refactor

src/heap/spaces.cc

 // Copyright 2011 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.
 
 #include "src/heap/spaces.h"
 
 #include "src/base/bits.h"
 #include "src/base/platform/platform.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/heap/slots-buffer.h"
@@ skipping 1394 matching lines @@
   InlineAllocationStep(old_top, allocation_info_.top());
 }
 
 
 void NewSpace::UpdateInlineAllocationLimit(int size_in_bytes) {
   if (heap()->inline_allocation_disabled()) {
     // Lowest limit when linear allocation was disabled.
     Address high = to_space_.page_high();
     Address new_top = allocation_info_.top() + size_in_bytes;
     allocation_info_.set_limit(Min(new_top, high));
-  } else if (inline_allocation_limit_step_ == 0) {
+  } else if (top_on_previous_step_ == 0) {

[ofrobots, 2015/10/12 22:39:42]

I did not need to make this change as part of this CL. It is equivalent. It does
pave the way to me remove inline_allocation_limit_step_ completely in a
subsequent CL.

     // Normal limit is the end of the current page.
     allocation_info_.set_limit(to_space_.page_high());
   } else {
     // Lower limit during incremental marking.
     Address high = to_space_.page_high();
     Address new_top = allocation_info_.top() + size_in_bytes;
     Address new_limit = new_top + inline_allocation_limit_step_;
     allocation_info_.set_limit(Min(new_limit, high));
   }
   DCHECK_SEMISPACE_ALLOCATION_INFO(allocation_info_, to_space_);
@@ skipping 1732 matching lines @@
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 }  // namespace internal
 }  // namespace v8