Add some more DISALLOW_COPY_AND_ASSIGN

May help prevent bugs maybe.

Change-Id: Ie73d469dfcd078492ecb3aa28682b42707221202
diff --git a/runtime/gc/heap-inl.h b/runtime/gc/heap-inl.h
index ac79ac2..fbf36e8 100644
--- a/runtime/gc/heap-inl.h
+++ b/runtime/gc/heap-inl.h
@@ -371,11 +371,8 @@
 }
 
 inline Heap::AllocationTimer::AllocationTimer(Heap* heap, mirror::Object** allocated_obj_ptr)
-    : heap_(heap), allocated_obj_ptr_(allocated_obj_ptr) {
-  if (kMeasureAllocationTime) {
-    allocation_start_time_ = NanoTime() / kTimeAdjust;
-  }
-}
+    : heap_(heap), allocated_obj_ptr_(allocated_obj_ptr),
+      allocation_start_time_(kMeasureAllocationTime ? NanoTime() / kTimeAdjust : 0u) { }
 
 inline Heap::AllocationTimer::~AllocationTimer() {
   if (kMeasureAllocationTime) {