Split ToDouble into two IL instruction to make it work with SSA.

runtime/vm/compiler.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/compiler.h"
 
 #include "vm/assembler.h"
 #include "vm/ast_printer.h"
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 387 matching lines @@
       OS::Print("--> '%s' entry: 0x%x\n",
                 function.ToFullyQualifiedCString(),
                 Code::Handle(function.CurrentCode()).EntryPoint());
     }
     if (Isolate::Current()->debugger()->IsActive()) {
       Isolate::Current()->debugger()->NotifyCompilation(function);
     }
     if (FLAG_disassemble) {
       DisassembleCode(function, optimized);
     } else if (FLAG_disassemble_optimized && optimized) {
-      // Print unoptimized code along with the optimized code.
-      DisassembleCode(function, false);
+      // TODO(fschneider): Print unoptimized code along with the optimized code.
       DisassembleCode(function, true);
     }
     isolate->set_long_jump_base(base);
     return Error::null();
   } else {
     Error& error = Error::Handle();
     // We got an error during compilation.
     error = isolate->object_store()->sticky_error();
     isolate->object_store()->clear_sticky_error();
     isolate->set_long_jump_base(base);
@@ skipping 112 matching lines @@
     result = isolate->object_store()->sticky_error();
     isolate->object_store()->clear_sticky_error();
     isolate->set_long_jump_base(base);
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 }  // namespace dart