Add default argument kIsInstrumented=true.

kIsInstrumented=false is reserved for use by specialized
entrypoints which are used only when we can ensure that
the code is not instrumented. So add the default argument
to simplify all other callers.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Change-Id: I3419795794fec9a1733ab3ad698b6415dbac679d
diff --git a/runtime/mirror/array.cc b/runtime/mirror/array.cc
index d42f5a0..9bff169 100644
--- a/runtime/mirror/array.cc
+++ b/runtime/mirror/array.cc
@@ -54,8 +54,8 @@
   Handle<mirror::Class> h_component_type(hs.NewHandle(array_class->GetComponentType()));
   size_t component_size_shift = h_component_type->GetPrimitiveTypeSizeShift();
   gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
-  Handle<Array> new_array(hs.NewHandle(Array::Alloc<true>(
-      self, array_class.Get(), array_length, component_size_shift, allocator_type)));
+  Handle<Array> new_array(hs.NewHandle(
+      Array::Alloc(self, array_class.Get(), array_length, component_size_shift, allocator_type)));
   if (UNLIKELY(new_array == nullptr)) {
     CHECK(self->IsExceptionPending());
     return nullptr;
@@ -122,11 +122,11 @@
 template<typename T>
 ObjPtr<PrimitiveArray<T>> PrimitiveArray<T>::Alloc(Thread* self, size_t length) {
   gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
-  ObjPtr<Array> raw_array = Array::Alloc<true>(self,
-                                               GetClassRoot<PrimitiveArray<T>>(),
-                                               length,
-                                               ComponentSizeShiftWidth(sizeof(T)),
-                                               allocator_type);
+  ObjPtr<Array> raw_array = Array::Alloc(self,
+                                         GetClassRoot<PrimitiveArray<T>>(),
+                                         length,
+                                         ComponentSizeShiftWidth(sizeof(T)),
+                                         allocator_type);
   return ObjPtr<PrimitiveArray<T>>::DownCast(raw_array);
 }
 
@@ -151,7 +151,7 @@
   const auto component_size = klass->GetComponentSize();
   const auto component_shift = klass->GetComponentSizeShift();
   ObjPtr<Array> new_array =
-      Alloc<true>(self, klass, new_length, component_shift, allocator_type);  // Invalidates klass.
+      Alloc(self, klass, new_length, component_shift, allocator_type);  // Invalidates klass.
   if (LIKELY(new_array != nullptr)) {
     memcpy(new_array->GetRawData(component_size, 0),
            h_this->GetRawData(component_size, 0),