A CL that only removes dead code from the VM compiler.

runtime/vm/flow_graph_compiler_x64.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_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 924 matching lines @@
   }
 
   EmitFrameEntry();
 
   const Function& function = parsed_function().function();
 
   const int num_fixed_params = function.num_fixed_parameters();
   const int num_copied_params = parsed_function().num_copied_params();
   const int num_locals = parsed_function().num_stack_locals();
 
-  // For optimized code, keep a bitmap of the frame in order to build
-  // stackmaps for GC safepoints in the prologue.
-  LocationSummary* prologue_locs = NULL;
-  if (is_optimizing()) {
-    // Spill slots are allocated but not initialized.
-    prologue_locs = new LocationSummary(0, 0, LocationSummary::kCall);
-    prologue_locs->stack_bitmap()->SetLength(StackSize());
-  }
-
   // We check the number of passed arguments when we have to copy them due to
   // the presence of optional parameters.
   // No such checking code is generated if only fixed parameters are declared,
   // unless we are in debug mode or unless we are compiling a closure.
   LocalVariable* saved_args_desc_var =
       parsed_function().GetSavedArgumentsDescriptorVar();
   if (num_copied_params == 0) {
 #ifdef DEBUG
     ASSERT(!parsed_function().function().HasOptionalParameters());
     const bool check_arguments = true;
@@ skipping 718 matching lines @@
 void ParallelMoveResolver::Exchange(const Address& mem1, const Address& mem2) {
   __ Exchange(mem1, mem2);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64