[gardening] Revert "Eliminate dependencies on assemblers and code stubs in precompiled runtime."

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) && !defined(DART_PRECOMPILED_RUNTIME)
+#if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/deopt_instructions.h"
 #include "vm/il_printer.h"
 #include "vm/instructions.h"
 #include "vm/locations.h"
@@ skipping 1658 matching lines @@
 
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   __ movups(reg, Address(RSP, 0));
   __ AddImmediate(RSP, Immediate(kFpuRegisterSize));
 }
 
 #undef __
 
 }  // namespace dart
 
-#endif  // defined(TARGET_ARCH_X64) && !defined(DART_PRECOMPILED_RUNTIME)
+#endif  // defined TARGET_ARCH_X64