Reland deprecation of HAllocateObject in favor of HAllocate.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 0a2ba9ff89c66f0c0f871accbf16d33afc8efd0a..2b92dd2f123164120435509018f0eed288769f72 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -67,7 +67,6 @@ class HBasicBlock: public ZoneObject {
   HInstruction* first() const { return first_; }
   HInstruction* last() const { return last_; }
   void set_last(HInstruction* instr) { last_ = instr; }
-  HInstruction* GetLastInstruction();
   HControlInstruction* end() const { return end_; }
   HLoopInformation* loop_information() const { return loop_information_; }
   const ZoneList<HBasicBlock*>* predecessors() const { return &predecessors_; }