Increase inlining depth limit for AOT optimization.

runtime/vm/flow_graph_compiler.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
@@ skipping 75 matching lines @@
 
     // Flags affecting compilation only:
     // There is no counter feedback in precompilation, so ignore the counter
     // when making inlining decisions.
     FLAG_inlining_hotness = 0;
     // Use smaller thresholds in precompilation as we are compiling everything
     // with the optimizing compiler instead of only hot functions.
     FLAG_inlining_size_threshold = 5;
     FLAG_inline_getters_setters_smaller_than = 5;
     FLAG_inlining_callee_size_threshold = 20;
-    FLAG_inlining_depth_threshold = 2;
+    FLAG_inlining_depth_threshold = 4;
     FLAG_inlining_caller_size_threshold = 1000;
     FLAG_inlining_constant_arguments_max_size_threshold = 100;
     FLAG_inlining_constant_arguments_min_size_threshold = 30;
 
     FLAG_background_compilation = false;
     FLAG_fields_may_be_reset = true;
     FLAG_interpret_irregexp = true;
     FLAG_lazy_dispatchers = false;
     FLAG_link_natives_lazily = true;
     FLAG_optimization_counter_threshold = -1;
@@ skipping 1871 matching lines @@
 
 
 void FlowGraphCompiler::FrameStateClear() {
   ASSERT(!is_optimizing());
   frame_state_.TruncateTo(0);
 }
 #endif  // defined(DEBUG) && !defined(TARGET_ARCH_DBC)
 
 
 }  // namespace dart