More allocation code optimizations.

- Inline Class::AllocObject() and Array::Alloc().
- Inline some short Mutex functions and add LIKELY/UNLIKELY to some
  Mutex functions.
- This change improves the Ritz MemAllocTest by ~6% on Nexus 4 and
  ~10% on host.

Bug: 9986565
Change-Id: I1606c74ddb21676cbc1de1a40e9b076fc23eaea4
diff --git a/runtime/indirect_reference_table_test.cc b/runtime/indirect_reference_table_test.cc
index bd2890c..b6c6cb4 100644
--- a/runtime/indirect_reference_table_test.cc
+++ b/runtime/indirect_reference_table_test.cc
@@ -17,6 +17,7 @@
 #include "common_test.h"
 
 #include "indirect_reference_table.h"
+#include "mirror/object-inl.h"
 
 namespace art {