Use MemoryChunk-based allocation for deoptimization entry code

src/spaces.h

 // 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 870 matching lines @@
   bool contains(Address address) {
     if (this == NULL || code_range_ == NULL) return false;
     Address start = static_cast<Address>(code_range_->address());
     return start <= address && address < start + code_range_->size();
   }
 
   // Allocates a chunk of memory from the large-object portion of
   // the code range.  On platforms with no separate code range, should
   // not be called.
   MUST_USE_RESULT Address AllocateRawMemory(const size_t requested,
-                                            size_t* allocated);
+                                            size_t* allocated,
+                                            bool committed = true);
+  bool CommitRawMemory(Address start, size_t size);
+  Address ReserveChunk(size_t body_size, size_t *reserved);
+
   void FreeRawMemory(Address buf, size_t length);
 
  private:
   Isolate* isolate_;
 
   // The reserved range of virtual memory that all code objects are put in.
   VirtualMemory* code_range_;
   // Plain old data class, just a struct plus a constructor.
   class FreeBlock {
    public:
@@ skipping 130 matching lines @@
   }
 
 #ifdef DEBUG
   // Reports statistic info of the space.
   void ReportStatistics();
 #endif
 
   MemoryChunk* AllocateChunk(intptr_t body_size,
                              Executability executable,
                              Space* space);
+  MemoryChunk* CommitChunkInCodeRange(Address start,
+                                      size_t body_size,
+                                      size_t reserved_size);
 
   Address ReserveAlignedMemory(size_t requested,
                                size_t alignment,
                                VirtualMemory* controller);
   Address AllocateAlignedMemory(size_t requested,
                                 size_t alignment,
                                 Executability executable,
                                 VirtualMemory* controller);
 
   void FreeMemory(VirtualMemory* reservation, Executability executable);
@@ skipping 1711 matching lines @@
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_H_