Improve compiler stats

- report the max size of arena alloc
- report how many virtual or interface invokes were inlined

Change-Id: I82f154a8e25b5e3890181a1aa11346cdc3f93e37
diff --git a/compiler/optimizing/inliner.cc b/compiler/optimizing/inliner.cc
index d861e39..8083553 100644
--- a/compiler/optimizing/inliner.cc
+++ b/compiler/optimizing/inliner.cc
@@ -293,7 +293,11 @@
   }
 
   if (actual_method != nullptr) {
-    return TryInlineAndReplace(invoke_instruction, actual_method, /* do_rtp */ true);
+    bool result = TryInlineAndReplace(invoke_instruction, actual_method, /* do_rtp */ true);
+    if (result && !invoke_instruction->IsInvokeStaticOrDirect()) {
+      MaybeRecordStat(kInlinedInvokeVirtualOrInterface);
+    }
+    return result;
   }
 
   DCHECK(!invoke_instruction->IsInvokeStaticOrDirect());