First implementation of allocation elimination in Hydrogen.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index fbe0531014e6c7a7adae10c6ffd03bfde43ff826..3abb92f0ac334bf078bbf6ff070dd1cd1dc8f27c 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -738,6 +738,9 @@ class Heap {
   MUST_USE_RESULT MaybeObject* AllocateJSObjectFromMap(
       Map* map, PretenureFlag pretenure = NOT_TENURED);
 
+  MUST_USE_RESULT MaybeObject* AllocateJSObjectFromMapForDeoptimizer(
+      Map* map, PretenureFlag pretenure = NOT_TENURED);
+
   MUST_USE_RESULT MaybeObject* AllocateJSObjectFromMapWithAllocationSite(
       Map* map, Handle<AllocationSite> allocation_site);