Remove unused FLAG_always_megamorphic_calls.

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 66 matching lines @@
     // 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_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_always_megamorphic_calls = true;
     FLAG_fields_may_be_reset = true;
     FLAG_interpret_irregexp = true;
     FLAG_lazy_dispatchers = false;
     FLAG_link_natives_lazily = true;
     FLAG_optimization_counter_threshold = -1;
     FLAG_polymorphic_with_deopt = false;
     FLAG_precompiled_mode = true;
     FLAG_reorder_basic_blocks = false;
     FLAG_use_field_guards = false;
     FLAG_use_cha_deopt = false;
@@ skipping 1091 matching lines @@
     intptr_t argument_count,
     LocationSummary* locs,
     const ICData& ic_data_in) {
   ICData& ic_data = ICData::ZoneHandle(ic_data_in.Original());
   if (FLAG_precompiled_mode) {
     ic_data = ic_data.AsUnaryClassChecks();
     EmitSwitchableInstanceCall(ic_data, argument_count,
                                deopt_id, token_pos, locs);
     return;
   }
-  if (FLAG_always_megamorphic_calls) {
-    EmitMegamorphicInstanceCall(ic_data_in, argument_count,
-                                deopt_id, token_pos, locs,
-                                CatchClauseNode::kInvalidTryIndex);
-    return;
-  }
   ASSERT(!ic_data.IsNull());
   if (is_optimizing() && (ic_data_in.NumberOfUsedChecks() == 0)) {
     // Emit IC call that will count and thus may need reoptimization at
     // function entry.
     ASSERT(may_reoptimize() || flow_graph().IsCompiledForOsr());
     switch (ic_data.NumArgsTested()) {
       case 1:
         EmitOptimizedInstanceCall(
             *StubCode::OneArgOptimizedCheckInlineCache_entry(), ic_data,
             argument_count, deopt_id, token_pos, locs);
@@ skipping 787 matching lines @@
 
 
 void FlowGraphCompiler::FrameStateClear() {
   ASSERT(!is_optimizing());
   frame_state_.TruncateTo(0);
 }
 #endif  // defined(DEBUG) && !defined(TARGET_ARCH_DBC)
 
 
 }  // namespace dart