Refactoring of snapshots. This simplifies and improves

src/heap-inl.h

Index: src/heap-inl.h
===================================================================
--- src/heap-inl.h	(revision 12497)
+++ src/heap-inl.h	(working copy)
@@ -741,17 +741,6 @@
 }
 
 
-LinearAllocationScope::LinearAllocationScope() {
-  HEAP->linear_allocation_scope_depth_++;
-}
-
-
-LinearAllocationScope::~LinearAllocationScope() {
-  HEAP->linear_allocation_scope_depth_--;
-  ASSERT(HEAP->linear_allocation_scope_depth_ >= 0);
-}
-
-
 #ifdef DEBUG
 void VerifyPointersVisitor::VisitPointers(Object** start, Object** end) {
   for (Object** current = start; current < end; current++) {