Use MemoryChunk-based allocation for deoptimization entry code

src/spaces.h

Index: src/spaces.h
===================================================================
--- src/spaces.h	(revision 13214)
+++ src/spaces.h	(working copy)
@@ -888,7 +888,11 @@
   // 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:
@@ -1039,6 +1043,9 @@
   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,