Use MemoryChunk-based allocation for deoptimization entry code

src/platform.h

Index: src/platform.h
===================================================================
--- src/platform.h	(revision 13274)
+++ src/platform.h	(working copy)
@@ -384,6 +384,11 @@
   // Initialize or resets an embedded VirtualMemory object.
   void Reset();
 
+  void Set(void* address, size_t size) {

[danno, 2012/12/28 11:58:37]

I don't think you need this, see the comment in spaces.cc

[haitao.feng, 2012/12/28 15:04:54]

I am using this to get a virtual memory from code range. Otherwise I need to
create a struct to record the reserved address and size.

[danno, 2012/12/28 15:38:10]

You don't need a struct, just store the base and size. This tuple of information
in _not_ a VirtualMemory object! VirtualMemory objects _always_ call
ReleaseRegion on their address() on destruction if address() is not zero... and
that will happen in your case. Please, please don't abuse VirtualMemory, which
is meant to reserve and manage a range of virtual addresses, for something it is
not.

On 2012/12/28 15:04:54, haitao.feng wrote:

+    address_ = address;
+    size_ = size;
+  }
+
   // Returns the start address of the reserved memory.
   // If the memory was reserved with an alignment, this address is not
   // necessarily aligned. The user might need to round it up to a multiple of