Use MemoryChunk-based allocation for deoptimization entry code

src/deoptimizer.h

Index: src/deoptimizer.h
===================================================================
--- src/deoptimizer.h	(revision 13214)
+++ src/deoptimizer.h	(working copy)
@@ -102,8 +102,17 @@
  private:
   int eager_deoptimization_entry_code_entries_;
   int lazy_deoptimization_entry_code_entries_;
+#if defined(V8_TARGET_ARCH_X64)

[Sven Panne, 2012/12/14 08:08:40]

Having architecture-specific stuff here in the architecture-independent parts is
the wrong approach, leading into the wrong direction. I would strongly object
any such change...

Our goal should be making the deoptimizer code more architecture-independent, we
already have *tons* of duplicated boilerplate code.

+  Address eager_deoptimization_entry_start_;

[danno, 2012/12/20 10:18:35]

Is there any reason why this shouldn't work identically on all platforms, taking
the deopt tables from the CodeSpace? If not, please make this cross platform.

+  size_t eager_deoptimization_reserved_size_;
+  MemoryChunk* eager_deoptimization_entry_code_;
+  Address lazy_deoptimization_entry_start_;
+  size_t lazy_deoptimization_reserved_size_;
+  MemoryChunk* lazy_deoptimization_entry_code_;
+#else
   VirtualMemory* eager_deoptimization_entry_code_;
   VirtualMemory* lazy_deoptimization_entry_code_;
+#endif
   Deoptimizer* current_;
 
 #ifdef ENABLE_DEBUGGER_SUPPORT