Do not clobber dead temp registers at RestoreLiveRegisters as it may destroy the content of the res…

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 "vm/ast_printer.h"
@@ skipping 1487 matching lines @@
   ClobberDeadTempRegisters(locs);
 #endif
 
   // TODO(vegorov): avoid saving non-volatile registers.
   __ PushRegisters(locs->live_registers()->cpu_registers(),
                    locs->live_registers()->fpu_registers());
 }
 
 
 void FlowGraphCompiler::RestoreLiveRegisters(LocationSummary* locs) {
-#if defined(DEBUG)
-  ClobberDeadTempRegisters(locs);
-#endif
   __ PopRegisters(locs->live_registers()->cpu_registers(),
                   locs->live_registers()->fpu_registers());
 }
 
 
 #if defined(DEBUG)
 void FlowGraphCompiler::ClobberDeadTempRegisters(LocationSummary* locs) {
   // Clobber temporaries that have not been manually preserved.
   for (intptr_t i = 0; i < locs->temp_count(); ++i) {
     Location tmp = locs->temp(i);
@@ skipping 288 matching lines @@
   __ movups(reg, Address(RSP, 0));
   __ AddImmediate(RSP, Immediate(kFpuRegisterSize), PP);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64