Be more flexible on the code unit size when inlining.

This change increases the maximum code unit size, and fold
parameters in the inlinee in the hope to reduce the overall
size of the graph. We then make sure we don't inline methods
that have more than N HInstructions.

Also, remove the kAccDontInline flag on ArtMethod. The compiler
does not need it anymore.

Change-Id: I4cd3da40e551f30ba83b8b274728b87e67f6812e
diff --git a/compiler/driver/compiler_options.h b/compiler/driver/compiler_options.h
index d2a90ec..18f215d 100644
--- a/compiler/driver/compiler_options.h
+++ b/compiler/driver/compiler_options.h
@@ -52,7 +52,7 @@
   static const bool kDefaultGenerateDebugInfo = kIsDebugBuild;
   static const bool kDefaultIncludePatchInformation = false;
   static const size_t kDefaultInlineDepthLimit = 3;
-  static const size_t kDefaultInlineMaxCodeUnits = 18;
+  static const size_t kDefaultInlineMaxCodeUnits = 20;
 
   // Default inlining settings when the space filter is used.
   static constexpr size_t kSpaceFilterInlineDepthLimit = 3;