Refactored FlowGraphBuilder into a separate FlowGraph representation.

runtime/vm/flow_graph_compiler_x64.cc

 // Copyright (c) 2012, 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 968 matching lines @@
   if (FLAG_print_scopes) {
     // Print the function scope (again) after generating the prologue in order
     // to see annotations such as allocation indices of locals.
     if (FLAG_print_ast) {
       // Second printing.
       OS::Print("Annotated ");
     }
     AstPrinter::PrintFunctionScope(parsed_function());
   }
 
+  ASSERT(!block_order().is_empty());
   VisitBlocks();
 
   __ int3();
   GenerateDeferredCode();
   // Emit function patching code. This will be swapped with the first 13 bytes
   // at entry point.
   pc_descriptors_list()->AddDescriptor(PcDescriptors::kPatchCode,
                                        assembler()->CodeSize(),
                                        Isolate::kNoDeoptId,
                                        0,
@@ skipping 215 matching lines @@
 void ParallelMoveResolver::Exchange(const Address& mem1, const Address& mem2) {
   __ Exchange(mem1, mem2);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64