Enables all codegen tests for arm64.

runtime/vm/assembler_arm64.h

Index: runtime/vm/assembler_arm64.h
===================================================================
--- runtime/vm/assembler_arm64.h	(revision 35440)
+++ runtime/vm/assembler_arm64.h	(working copy)
@@ -699,6 +699,7 @@
   // pool pointer is in another register, or that it is not available at all,
   // PP should be passed for pp.
   void AddImmediate(Register dest, Register rn, int64_t imm, Register pp);
+  void TestImmediate(Register rn, int64_t imm, Register pp);
   void CompareImmediate(Register rn, int64_t imm, Register pp);
 
   void LoadFromOffset(Register dest, Register base, int32_t offset,
@@ -754,6 +755,7 @@
     LoadObject(TMP, object, pp);
     Push(TMP);
   }
+  void CompareObject(Register reg, const Object& object, Register pp);
 
   void LoadClassId(Register result, Register object);
   void LoadClassById(Register result, Register class_id);
@@ -777,6 +779,10 @@
   void EnterStubFrame(bool load_pp = false);
   void LeaveStubFrame();
 
+  void UpdateAllocationStats(intptr_t cid,
+                             Register temp_reg,
+                             Heap::Space space = Heap::kNew);
+
  private:
   AssemblerBuffer buffer_;  // Contains position independent code.